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bbdbe1c12c9bbe5970ea717e1759144a1221f0cd
subsection
313
319
Deriving discontinuities for
Taking expression (REF ) and replacing L_{N|(v)w}\rightarrow -\Lambda _N we find directly that we can write the discontinuities for l\ge 1 as&\left[ \log Y_{M} \right]_{\tau (M+2l)} = \sum _{J=1}^{l+1}\sum _{Q=1+J}^{M+J-1} \left[L_{vw|Q-1}^{(\alpha )}\right]_{\tau (Q+2l-2J+1)} + \left[L_-^{(\alpha )}\right]_{\tau 2l} -...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1617, "openalex_id": "", "raw": "A. Cavagli`a, D. Fioravanti and R. Tateo, “Extended Y-system for the AdS_5/CFT_4 correspondence”, Nucl.Phys. B843, 302 (2011), arxiv:1005.3016.", "source_ref_id": "ed7f9a203b2f38f3ce07ed3c8c3...
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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e29806b38aa78a2cdf963797e80fc93b4967b9fd
subsection
314
319
Deriving discontinuities for
The discontinuity of Y_Q can now be written as follows for all l\ge 0:\left[ \log Y_{M} \right]_{\tau (M+2l)}(u) &= \left[D_{\tau (M+2l)}^Q\right]_0 (u) -\delta _{l,0}\left[\log Y_{1}\right]_{-\tau 1}(u).This will allow us to continue the derivation of the Y_Q TBA-equation in section (REF ).
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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f2118726f7cf25f484e633fd1a708221c5561d71
subsection
315
319
Two lemmas
In this appendix we will consider a few technical lemmas that are necessary for the correctness of the argumentation in the main text. We will show that \mathbf {P} functions can be expanded in terms of the x function and that periodic analytic functions with exponential growth must be trigonometric polynomials.
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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3900242d2b793ff46b777011217e87bd4a7db36f
subsection
316
319
Undeformed case.
\mathbf {P} functions have short cuts and it seems natural to expect an expansion in the x_s function, which we will denote simply by x from now on. As a function x: it is not surjective, its image is given by \begin{equation} {>1} :=\left\lbrace z \in | \, |z| >1 \right\rbrace . \end{equation} Therefore the inverse x-...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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28690904d2e3349dc0839ad8405b1ec13deb77f3
subsection
317
319
Deformed case.
In the deformed case the u domain takes the form of a cylinder. \mathbf {P} functions are periodic or anti-periodic, and in the latter case multiplication by an anti-periodic prefactor such as e^{iu/2} makes it periodic. We will consider only this case. The deformed x-function is surjective as a function x:i \mathbb {R...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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2b2eaff0da77a5a1bc49296270c04d0f5aa96cc7
subsection
318
319
Lemma.
Let f: i \mathbb {R}\times [-\pi ,\pi ) \rightarrow be analytic and have infinitely many non-zero coefficients an on the positive side (thus for positive n) of its Fourier series \begin{equation}f(u) = \sum _{n\in \mathbb {Z}} a_n e^{-inu}. \end{equation}Then f grows superexponentially, i.e. \begin{equation}\lim _{u \r...
{ "cite_spans": [] }
1804.06741
Quantum spectral curve for the $\eta$-deformed AdS$_5 \times $S$^5$ superstring
[ "Rob Klabbers" ]
[ "hep-th", "math-ph", "math.MP" ]
2,018
en
Physics
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2ffad420ebd36dabc77c21fdfd3e34a84a94dc2c
abstract
0
95
Abstract
We outline a definition of accessible and presentable objects in a 2-category $\mathcal K$ endowed with a "KZ context", that is to say a pair of lax-idempotent monads interacting in a prescribed way; this perspective suggests a unified treatment of many "Gabriel-Ulmer like" theorems, asserting how presentable objects a...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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4eeff24d4c7d965bb3feed22f48aeafb9ead493b
subsection
1
95
Introduction
“The theory of categories enriched in some base closed category , is couched in set-theory; some of the interesting results even require a hierarchy of set-theories. Yet, there is a sense in which the results themselves are of an elementary nature.” The present work stems from the conjoint desire of both authors to det...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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e57b8168837c89fde36e9ea3176dd05381bd5a7d
subsection
2
95
Introduction
A well-known Leibnizian principle in 2-category theory asserts that we can probe the internal structure of an object only via external universal properties; this forces us to the choice of as a formal incarnation of (say) \lambda -filtered colimit completion for A\in ; it is clear how the recent as well as the very rec...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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5024fa4e6e119f95c3e84b85ad368a77fc8d82fb
subsection
3
95
Introduction
We define a Gabriel Hypothesis Ulmer envelope in REF as a 1-cell \iota _A : A\rightarrow \widehat{A} such that \widehat{A} \rightarrow (\widehat{A}) exhibits a suitable universal property; given such an envelope, we can cook a bi-equivalence of 2-categories \text{\begin{}{UTF8}{min}よ\end{}}\textsf {-Mod}: \text{L\hsp...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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bc9ae219d6161d8591d9c4efee0881c5ad2e4d34
subsection
4
95
Introduction
Classical Gabriel Hypothesis Ulmer duality is an instance of this general paradigm, since in \protect {\underline{\text{\fontseries {b}\selectfont {\upshape Cat}}}} the construction A\mapsto \widehat{A} that sends A into its finite- (resp., \lambda -small) limit completion has precisely the property that {I\hspace{-1.4...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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189300e4b7be69bf8e39073bad3f92d2dcbe4442
subsection
5
95
Introduction
It is then clear that left extensions in are left liftings in ^\mathrm {op}, right liftings in are left liftings in ^\mathrm {co}, and right extensions are left liftings in ^\mathrm {coop}. The situation is conveniently depicted in the following array of universal objects: \begin{array}{c|c} {A @{}[dr]|(.3){\rotatebox...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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0abb0ce5e8c6e90a99eecb354a2e27b8bcc94d82
subsection
6
95
Introduction
A useful lemma of gluing together extensions and lifts is the following: Lemma Given the diagrams of 2-cells \begin{} [ execute at end picture={ [on background layer] [gray!50] (a.center) -- (c.center) to[bend right=35] (d.center); [on background layer] [gray!50] (a^{\prime }.center) -- (b^{\prime }.center) -- (d^{\pr...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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0458061f0f59cb39d605755f1755a1bcd8b22b0d
subsection
7
95
Introduction
For each admissible A, in the diagram { &A[dr]^{y_A} [dl]_{y_A}@{}[d]|(.6){\rotatebox [origin=c]{225}{\Rightarrow }\chi ^{y_A}}&\\ A && A @{=}[ll] } the 2-cell \chi ^{y_A} exhibits \langle 1_{A}, 1_{y_A}\rangle as a left extension. For admissible A, B and f,g as below, the diagram \begin{}[column sep=large, row s...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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00c06a90db1c846cf2fb4a542baf65c10e74d408
subsection
8
95
Introduction
This claim becomes evident as soon as we rephrase REF as follows: given a pair of composable the universal property of \chi ^{gf} entails that there is a unique 2-cell \theta ^{gf} : filling the diagram \begin{}[column sep=huge, row sep=huge] A [dashed,Rightarrow,dr, shorten <=1.9cm, "\theta ^{gf}", pos=.9][r, "y_A"{n...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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cfa11424cb89ad6ef42230d4ba8da80f8c994e5b
subsection
9
95
Introduction
Moreover, we will need an additional weakening, in that the archetypal example of such a structure (the correspondence taking an object of \protect {\underline{\text{\fontseries {b}\selectfont {\upshape CAT}}}} to its free cocompletion under a prescribed class of colimits) fails to be a pseudomonad for size reasons, si...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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6ab6e87dfbc75a77ddfaeaff180f00f252a5ab88
subsection
10
95
Introduction
As for the first notion, since the canonical example of a Yoneda structure is free cocompletion under colimits, must “recognize cocomplete objects” exhibiting a similar universal property as that of \protect {\underline{\text{\fontseries {b}\selectfont {\upshape Cat}}}}; briefly, one can define a cocomplete category as...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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2d0ea79bf0ea1a24a4cdb542b36923dcdcbe8058
subsection
11
95
Introduction
Definition (The 2-category of relative kz Hypothesis doctrines on ) Let be a 2-category; we define a 2-category \protect {\underline{\text{\fontseries {b}\selectfont {\upshape RKZ}}}}() whose 0-cells are the relative kz Hypothesis doctrines on , and whose hom-category is the one of pseudonatural transformations \text{...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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847c0c49a02b0915794db756ffec67ddef713a93
subsection
12
95
Introduction
Remark The definition of accessible object in depending on the above discussion will be given right away at the beginning of the next section; it is easy to motivate REF as follows: there is a standard choice for a Yoneda context on the 2-category \protect {\underline{\text{\fontseries {b}\selectfont {\upshape CAT}}}}...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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d8be5b3a2c3505d569430ffc19381f0d86794e99
subsection
13
95
Introduction
Remark The 2-category \protect {\underline{\text{\fontseries {b}\selectfont {\upshape RKZ}}}}(\protect {\underline{\text{\fontseries {b}\selectfont {\upshape Cat}}}})/ is visibly populated by many other objects: a slight variation on the above theme gives a Yoneda context \text{\begin{}{UTF8}{min}よ\end{}}_{\textsc {c}...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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7637cedbae868c9bae31acccabecf599a4f0ff61
subsection
14
95
Introduction
For the simple reason that in general one cannot expect that always dominates the Yoneda structure , we will favour the first definition of presentability. However, since it has been an instructive challenge to devise an abstract definition encompassing REF , and in particular to define a “functor preserving -filtered ...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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82f29b69bfec159aee82b21d0656a7c0f2fab865
subsection
15
95
Introduction
We shall focus on the following diagram. { \bar{G} [r]^\ell [dr]_{y^{}_{\bar{G}} }& (G) [r]^i & G^{\prime } \\ & \bar{G} [u]_{L} [ur]_{\text{Yan}_G(\ell i)}& } By assumption, i\cong \text{Yan}_G(i y_G), and this extension is pointwise; since has finite limits, we can build the comma object (\ell /y_G), and the resul...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1017/cbo9780511600579", "end": 2185, "openalex_id": "https://openalex.org/W1595870841", "raw": "J. Adámek and J. Rosický, Locally presentable and accessible categories, London Mathematical Society Lecture Note Series, vol. 189, Cambridge...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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1edf02dfb3fe81f60e0ebc3d04aec7ec7687c80d
subsection
16
95
Introduction
To show that A is cocomplete, we can appeal the easy result that reflective subobjects of -cocomplete objects remain -cocomplete. This concludes the first implication. Now assume that A is accessible; we shall show that the axioms REF –REF hold. Since A is -cocomplete, i has a left adjoint; REF is part of the assumptio...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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ee5c814889637b5509113a0354c60254129e8910
subsection
17
95
Introduction
In particular this means that the diagram @R=5mm@C=5mm{ A[rr]^{y^{}_A}[dd]_{\iota _A} && A \\ &(\widehat{A})@{=}[ur]\\ \widehat{A} [ur]_{y^{}_{\widehat{A}}} } commutes. Moreover, for every \widehat{(\,\rule {}{}\,)}-cell f : G\rightarrow G^{\prime } between \widehat{(\,\rule {}{}\,)}-cocomplete objects, there exists...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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5a9ccd3f449a85afd2e23089ce474391d500f691
subsection
18
95
Introduction
Formal Gabriel-Ulmer duality (the present terse but very clear introduction to Gabriel-Ulmer duality comes from ) Gabriel-Ulmer duality builds an a biequivalence \textsf {Mod} : \underline{\text{Lex}}^\mathrm {op}\leftrightarrows \underline{\text{LFP}} : \textsf {Th} between the 2-category of small finitely complete ...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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b6d5c9799998fc2bd5fc6641946fe18d5c0abd7a
subsection
19
95
Introduction
Theorem (Gabriel Hypothesis Ulmer duality) Let \text{\begin{}{UTF8}{min}よ\end{}}: \Rightarrow be a context on , with climbable and assume that there exist a gu envelope relative to \text{\begin{}{UTF8}{min}よ\end{}}. There is a biadjunction \text{\begin{}{UTF8}{min}よ\end{}}\textsf {-Mod}: \text{L\hspace{-1.66702pt}Ê}...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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8fdae324e87514d178371c22eeb0f2c5c83ad5fc
subsection
20
95
Introduction
We start defining the action of the functors \text{\begin{}{UTF8}{min}よ\end{}}\textsf {-Mod} and \text{\begin{}{UTF8}{min}よ\end{}}\textsf {-Th}; the first is defined “applying ”, in the sense that its action on 0- and 1-cells is as follows: { G @[lightgray]@{^{(}->}@<-4pt>[r]_{\color {lightgray} i_G} & \color {lightg...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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0fdeae8bf6062104085e07be7617b23ca9ef6d18
subsection
21
95
Introduction
We have to check that this really defines a functor taking values in \textsc {Pr}(\text{\begin{}{UTF8}{min}よ\end{}}); this is easily seen, as every G is -cocomplete (it's a reflection of X for a suitable X), and each F is an -cell since in the diagram { G @{}[drr]|\rotatebox [origin=c]{225}{\Rightarrow }[dr]^F @/^1pc/...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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d0e711dbe35133302328fca483eafda171ae08d7
subsection
22
95
Introduction
We need to check that this is a \widehat{(\,\rule {}{}\,)}-cell, and in order to do this we consider the diagram { H[r]^\ell @/_1.5pc/[ddr]_{y_H} & G^{\prime }[r]^F @{}[d]|\dashv @<4pt>[d] & G@{}[d]|\dashv @<4pt>[d] \\ & \widehat{G}^{\prime }[r]_{\widehat{F}}@<4pt>[u] & \widehat{G} @<4pt>[u]\\ & \widehat{H}[u]@/_1pc/...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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60f699a2d90c2c21afa81d64a7e7b2b1b1442198
subsection
23
95
Introduction
In the diagram { G^{\prime }@/_2pc/[dd]_{y_{G^{\prime }}} [d]_\ell & G[l]_q [d]^{y_G}\\ A@<-4pt>@{^{(}->}[r]_i & G@<-4pt>[l]_L@{}[l]|\perp @{.>}@/^1pc/[dl]^\Sigma \\ G^{\prime }@{.>}[u]^\Lambda } -cocompleteness properties imply the existence of 1-cells \Lambda = \text{Yan}_{G^{\prime }}(\ell ) : G^{\prime }\rightar...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.040070854127407074, -0.014931200072169304, -0.01482438575476408, -0.020752614364027977, 0.014168236404657364, -0.07458733767271042, 0.025284618139266968, 0.03521840646862984, -0.01367994025349617, 0.026459582149982452, -0.03512685000896454, -0.02220224402844906, -0.02198861539363861, 0....
066be93014427ca0bc2bc636830e7fc35a8957d6
subsection
24
95
Introduction
Examples Example (Categories and the \lambda -Pres doctrine) In the 2-category of categories, functors, and natural transformations, the canonical Yoneda structure of REF having A = [A^\mathrm {op},\text{\fontseries {b}\selectfont {\upshape Set}}] yields notions of accessible and presentable that coincide with the cla...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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28ca0e8d836708fd2f6ad1fd26e834b39d522de4
subsection
25
95
Introduction
The notion of accessible and presentable object in the 2-category of -enriched categories, -enriched functors and -natural transformations, with its natural Yoneda structure having A = [A^\mathrm {op},] was first outlined in , , ; more in detail, the first two papers establish the theory of accessibility, and the last ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1017/s0004972700021900", "end": 381, "openalex_id": "https://openalex.org/W2070302638", "raw": "F. Borceux and C. Quinteiro, Enriched accessible categories, Bulletin of the Australian Mathematical Society 54 (1996), no. 3, 489–501.", ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.021635599434375763, 0.03152266889810562, -0.004722297191619873, 0.03881591185927391, 0.00018607397214509547, -0.05489766225218773, -0.00301723531447351, 0.042355727404356, 0.02226116880774498, 0.030775036662817, -0.025999337434768677, 0.015944428741931915, -0.0020407342817634344, -0.007...
b9df9b9b9b88516f2e61b5dd9737a2fca96f72cf
subsection
26
95
Introduction
It is an interesting fact that the whole context \text{\begin{}{UTF8}{min}よ\end{}}_{\textsc {c},\lambda } : {I\hspace{-1.49994pt}n\hspace{-1.00006pt}d}_\lambda \Rightarrow restricts to this framework, as the convolution of two functors that are \lambda -filtered colimits of representables (say, on filtered categories I...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/0021-8693(78)90160-6", "end": 2112, "openalex_id": "https://openalex.org/W2031120504", "raw": "R. Street and R. Walters, Yoneda structures on 2-categories, J. Algebra 50 (1978), no. 2, 350–379.", "source_ref_id": "1e3c613aa32e...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.06087367236614227, 0.02102353796362877, -0.007887640967965126, 0.04427453503012657, 0.022152524441480637, -0.03789729252457619, -0.02604294754564762, 0.05217743292450905, 0.002744273515418172, 0.030772479251027107, -0.012968075461685658, 0.003777905600145459, -0.023968053981661797, 0.00...
7d45b8cbb1bda47503e1dbb4a27e2cbb6c830801
subsection
27
95
Introduction
In particular For a \infty -category, or more generally a simplicial set, filteredness is captured as a lifting property against certain cofibrations (T.5.3.1.7) and moreover this property is equivalent (T.5.3.1.13) to a property of topologically enriched categories. \lambda -accessible and \lambda -presentable \inft...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/j.aim.2015.04.021", "end": 1331, "openalex_id": "https://openalex.org/W2963131328", "raw": "E. Riehl and D. Verity, The 2-category theory of quasi-categories, Advances in Mathematics 280 (2015), 549–642.", "source_ref_id": "f0...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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0970fac5cc73170fdb9a30c35c381499e7a67a22
subsection
28
95
Introduction
Our conjecture here is that derivator theory homes a theory of accessibility and presentability mainly because the 2-category \protect {\underline{\text{\fontseries {b}\selectfont {\upshape PDer}}}} (and its subcategory \protect {\underline{\text{\fontseries {b}\selectfont {\upshape Der}}}} of derivators) possesses a s...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/0022-4049(81)90021-9", "end": 1327, "openalex_id": "https://openalex.org/W2060119423", "raw": ", Conspectus of variable categories, Journal of Pure and Applied Algebra 21 (1981), no. 3, 307–338.", "source_ref_id": "e22db0efdde...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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408b0a3f01961ddbb5f2a6355e97335a5d306975
subsection
29
95
Introduction
The Cisinski-Tabuada Yoneda structure, (following ; there, the authors prove that for every stable derivator there is an action \text{\fontseries {b}\selectfont {\upshape Sp}}\times \rightarrow that can be promoted to a two-variable adjunction, using Brown representability). The internal-hom part of this two-variable a...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 277, "openalex_id": "", "raw": "Denis-Charles Cisinski and Gonçalo Tabuada, Non-connective K-theory via universal invariants, Compos. Math. 147 (2011), no. 4, 1281–1320.", "source_ref_id": "0d9d29e1e8902b68471b06f7d978216a1f...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.0715302899479866, 0.013289863243699074, -0.019774584099650383, 0.06222280487418175, 0.0015162803465500474, -0.07055376470088959, 0.009948325343430042, 0.029295681044459343, 0.014640211127698421, 0.031096143648028374, -0.015166617929935455, 0.002735026413574815, -0.02735789306461811, -0....
0bf518d4c0430d1f7a175cc1bf6fc14f9c0cbbc7
subsection
30
95
Yoneda Structures
The notion of Yoneda structure was given in in order to capture a formal framework in which one can develop abstract category theory; the definition encompasses different facets of the Yoneda lemma, recognized as the backbone of categorical algebra. Roughly speaking, a Yoneda structure on provides a “presheaf construct...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/0021-8693(78)90160-6", "end": 250, "openalex_id": "https://openalex.org/W2031120504", "raw": "R. Street and R. Walters, Yoneda structures on 2-categories, J. Algebra 50 (1978), no. 2, 350–379.", "source_ref_id": "1e3c613aa32ee...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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7523fa1e4fa427a045e9348d396ab2062a959177
subsection
31
95
Yoneda Structures
Remark In order to avoid a certain notational pedantry, and clumsy accumulation of super- and subscripts, we will usually shorten y_A^{}, B(f,1)_{}, and \chi ^f_{} to the simpler y_A, \chi ^f, B(f,1); we will nevertheless explicitly tell from which Yoneda structure we are taking these maps from, when working with two d...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/0021-8693(78)90160-6", "end": 635, "openalex_id": "https://openalex.org/W2031120504", "raw": "R. Street and R. Walters, Yoneda structures on 2-categories, J. Algebra 50 (1978), no. 2, 350–379.", "source_ref_id": "1e3c613aa32ee...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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2bf474862b0e4467df605ed743825bb1667a80ac
subsection
32
95
Yoneda Structures
This special kind of left extension is so ubiquitous in our discussion that it deserved a special name: in such a situation, we shortly denote L=\text{Lan}_{y^{}_A}\ell as \text{Yan}_A(\ell ). This concludes our introduction on Yoneda structures; now we move to the second relevant definition of this introductory sect...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.023859018459916115, 0.02219620905816555, -0.03774118423461914, 0.020304573699831963, -0.012982112355530262, -0.02977800741791725, 0.045155175030231476, 0.021616514772176743, 0.010831139981746674, -0.001705713802948594, -0.034049443900585175, 0.030083108693361282, -0.04359915107488632, 0...
c0a3a9050fc0632e44f1e2af50e5b4039adc7a18
subsection
33
95
Yoneda Structures
We end this subsection recalling the definitions of -cocomplete object and introducing the notion of a -cell. Both notions are not new to formal category theory, as the first appears in the theory of pro-arrow equipments , , and the second is called under the name “-homomorphism”. As for the first notion, since the can...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 282, "openalex_id": "https://openalex.org/W2247650440", "raw": "R.J. Wood, Abstract pro arrows I, Cahiers de topologie et géometrie différentielle categoriques 23 (1982), no. 3, 279–290.", "source_ref_id": "0f1d55c98c4632427...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.023617252707481384, -0.021618634462356567, -0.05336766690015793, 0.01655343547463417, 0.019757326692342758, -0.05763952061533928, 0.027263585478067398, 0.03832463547587395, -0.007571099326014519, -0.003207704983651638, -0.02526496723294258, -0.01672125793993473, -0.019818352535367012, 0...
6acbb643da4739091f6a4952568832a7da85d250
subsection
34
95
Yoneda Structures
Definition (The 2-category of relative kz Hypothesis doctrines on ) Let be a 2-category; we define a 2-category \protect {\underline{\text{\fontseries {b}\selectfont {\upshape RKZ}}}}() whose 0-cells are the relative kz Hypothesis doctrines on , and whose hom-category is the one of pseudonatural transformations \text{...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.02733720652759075, 0.012928728945553303, -0.00425236951559782, 0.044148366898298264, 0.006742770783603191, -0.029701752588152885, 0.05046399310231209, 0.03938876464962959, -0.011265918612480164, 0.008314049802720547, -0.041432954370975494, 0.002175763947889209, -0.023828525096178055, 0....
266e61b7bfc63e76fb5d4cc844e90c5d222f1561
subsection
35
95
Yoneda Structures
Remark The definition of accessible object in depending on the above discussion will be given right away at the beginning of the next section; it is easy to motivate REF as follows: there is a standard choice for a Yoneda context on the 2-category \protect {\underline{\text{\fontseries {b}\selectfont {\upshape CAT}}}}...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/s0022-4049(98)00108-x", "end": 1201, "openalex_id": "https://openalex.org/W2069651005", "raw": "M. Bunge and J. Funk, On a bicomma object condition for KZ-doctrines, J. Pure Appl. Algebra 143 (1999), no. 1-3, 69–105.", "source...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ 0.0018827138701453805, 0.019059855490922928, -0.026873022317886353, 0.04913749918341637, 0.02354632318019867, -0.057194825261831284, -0.0026151982601732016, 0.012085992842912674, 0.004387276712805033, 0.003818838158622384, -0.00782079715281725, 0.013016859069466591, -0.02093684673309326, 0...
edd87850fe12fdc3ffb538ee06e10149d5c63876
subsection
36
95
Yoneda Structures
Remark The 2-category \protect {\underline{\text{\fontseries {b}\selectfont {\upshape RKZ}}}}(\protect {\underline{\text{\fontseries {b}\selectfont {\upshape Cat}}}})/ is visibly populated by many other objects: a slight variation on the above theme gives a Yoneda context \text{\begin{}{UTF8}{min}よ\end{}}_{\textsc {c}...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/s0022-4049(02)00126-3", "end": 757, "openalex_id": "https://openalex.org/W1964399571", "raw": "J. Adámek, F. Borceux, S. Lack, and J. Rosický, A classification of accessible categories, Theory Appl. Categ. (2002), 7–30.", "sou...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.023686254397034645, 0.008165042847394943, -0.0020641533192247152, 0.038368068635463715, 0.016986340284347534, -0.05695689469575882, -0.006329815834760666, 0.04285502806305885, 0.005715529900044203, 0.015872232615947723, -0.017077911645174026, 0.012995390221476555, -0.005955902393907309, ...
a1101a79cb6fdb09ae95d7c955437670bfd16d2d
subsection
37
95
Yoneda Structures
For the simple reason that in general one cannot expect that always dominates the Yoneda structure , we will favour the first definition of presentability. However, since it has been an instructive challenge to devise an abstract definition encompassing REF , and in particular to define a “functor preserving -filtered ...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.03009195439517498, -0.02874911017715931, -0.01835731416940689, 0.023576101288199425, 0.000593694276176393, -0.0494716614484787, 0.014374555088579655, 0.058535873889923096, 0.007904479280114174, 0.040590569376945496, -0.034791916608810425, 0.005768133327364922, -0.01748751476407051, 0.02...
1bc8c2560d6f892c59bafa74849bf44a4caa5dd6
subsection
38
95
Yoneda Structures
We shall focus on the following diagram. { \bar{G} [r]^\ell [dr]_{y^{}_{\bar{G}} }& (G) [r]^i & G^{\prime } \\ & \bar{G} [u]_{L} [ur]_{\text{Yan}_G(\ell i)}& } By assumption, i\cong \text{Yan}_G(i y_G), and this extension is pointwise; since has finite limits, we can build the comma object (\ell /y_G), and the resul...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1017/cbo9780511600579", "end": 2185, "openalex_id": "https://openalex.org/W1595870841", "raw": "J. Adámek and J. Rosický, Locally presentable and accessible categories, London Mathematical Society Lecture Note Series, vol. 189, Cambridge...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.04762145131826401, 0.0011705032084137201, -0.005662678740918636, 0.007074532564729452, 0.02333756349980831, -0.021353336051106453, -0.021154914051294327, 0.029824459925293922, 0.007696511689573526, 0.04868987947702408, -0.025718634948134422, 0.015263285487890244, -0.0015559011371806264, ...
242e897092005e17ea55f85e969562cc2f42411e
subsection
39
95
Yoneda Structures
To show that A is cocomplete, we can appeal the easy result that reflective subobjects of -cocomplete objects remain -cocomplete. This concludes the first implication. Now assume that A is accessible; we shall show that the axioms REF –REF hold. Since A is -cocomplete, i has a left adjoint; REF is part of the assumptio...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.058313265442848206, 0.008566954173147678, -0.014959747903048992, 0.011069145984947681, -0.0025555919855833054, -0.04729752242565155, -0.005057783331722021, 0.02961435168981552, 0.015127577818930149, 0.006205892655998468, -0.010603799484670162, 0.0017498175147920847, -0.004794595297425985,...
c694e0a11f7d7cd3fa274dfeab6a3e22205c1908
subsection
40
95
Yoneda Structures
In particular this means that the diagram @R=5mm@C=5mm{ A[rr]^{y^{}_A}[dd]_{\iota _A} && A \\ &(\widehat{A})@{=}[ur]\\ \widehat{A} [ur]_{y^{}_{\widehat{A}}} } commutes. Moreover, for every \widehat{(\,\rule {}{}\,)}-cell f : G\rightarrow G^{\prime } between \widehat{(\,\rule {}{}\,)}-cocomplete objects, there exists...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.037079818546772, 0.01692243665456772, -0.005901489872485399, -0.013283120468258858, 0.023880623281002045, -0.061128292232751846, -0.03833107277750969, 0.015686441212892532, -0.03942973166704178, 0.015640664845705032, -0.03570649400353432, -0.006366895046085119, -0.0037060745526105165, 0...
1a8e243498bd13b5cfa215ef5d00196b0a7acb3f
subsection
41
95
Yoneda Structures
Formal Gabriel-Ulmer duality (the present terse but very clear introduction to Gabriel-Ulmer duality comes from ) Gabriel-Ulmer duality builds an a biequivalence \textsf {Mod} : \underline{\text{Lex}}^\mathrm {op}\leftrightarrows \underline{\text{LFP}} : \textsf {Th} between the 2-category of small finitely complete ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 529, "openalex_id": "", "raw": "The nLab, Gabriel-ulmer duality, https://ncatlab.org/nlab/revision/Gabriel-Ulmer+duality/11, February 22, 2018.", "source_ref_id": "7c6358c39ef12a001c6b8ff259c1e10d10d142a4", "start": 0 ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.07001256197690964, -0.014969992451369762, -0.013253250159323215, 0.01904439367353916, -0.01745736226439476, -0.012345284223556519, 0.0028135499451309443, 0.06039880961179733, 0.010468312539160252, 0.02261521853506565, -0.03531148284673691, 0.007416326552629471, -0.029665306210517883, -0...
dc7bffdc0ecc8695ced334d95dfb7b3f9c9e7f95
subsection
42
95
Yoneda Structures
Theorem (Gabriel Hypothesis Ulmer duality) Let \text{\begin{}{UTF8}{min}よ\end{}}: \Rightarrow be a context on , with climbable and assume that there exist a gu envelope relative to \text{\begin{}{UTF8}{min}よ\end{}}. There is a biadjunction \text{\begin{}{UTF8}{min}よ\end{}}\textsf {-Mod}: \text{L\hspace{-1.66702pt}Ê}...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 495, "openalex_id": "https://openalex.org/W1557248512", "raw": "G.M. Kelly, Structures defined by finite limits in the enriched context, I, Cahiers de topologie et géométrie différentielle catégoriques 23 (1982), no. 1, 3–42.", ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.08820556104183197, 0.0028498941101133823, 0.009224958717823029, 0.011582702398300171, -0.002367281587794423, -0.007519599981606007, -0.007790473755449057, 0.05447990447282791, 0.00585620803758502, 0.0048604621551930904, -0.025103485211730003, -0.003399271285161376, -0.011346165090799332, ...
28fb37a1d83ca1f8b77f04816b2b666d742c70b1
subsection
43
95
Yoneda Structures
We start defining the action of the functors \text{\begin{}{UTF8}{min}よ\end{}}\textsf {-Mod} and \text{\begin{}{UTF8}{min}よ\end{}}\textsf {-Th}; the first is defined “applying ”, in the sense that its action on 0- and 1-cells is as follows: { G @[lightgray]@{^{(}->}@<-4pt>[r]_{\color {lightgray} i_G} & \color {lightg...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.017150234431028366, -0.019118545576930046, -0.03161502256989479, 0.027983568608760834, -0.014609741978347301, -0.044828638434410095, 0.007564260624349117, 0.049955397844314575, -0.025343896821141243, 0.008773474022746086, -0.05535680800676346, -0.0323779359459877, -0.0034769659396260977, ...
9c0d2c7cd45511b4a3b8d903499acbe81640a837
subsection
44
95
Yoneda Structures
We have to check that this really defines a functor taking values in \textsc {Pr}(\text{\begin{}{UTF8}{min}よ\end{}}); this is easily seen, as every G is -cocomplete (it's a reflection of X for a suitable X), and each F is an -cell since in the diagram { G @{}[drr]|\rotatebox [origin=c]{225}{\Rightarrow }[dr]^F @/^1pc/...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.028078434988856316, -0.016908101737499237, -0.030474256724119186, 0.00811832956969738, 0.035037003457546234, -0.06677784025669098, 0.028383634984493256, 0.012307205237448215, -0.012131715193390846, 0.020250044763088226, -0.046726178377866745, -0.01893768273293972, -0.019761724397540092, ...
9c80f91fb597434710de3063d157562832d1ddf4
subsection
45
95
Yoneda Structures
We need to check that this is a \widehat{(\,\rule {}{}\,)}-cell, and in order to do this we consider the diagram { H[r]^\ell @/_1.5pc/[ddr]_{y_H} & G^{\prime }[r]^F @{}[d]|\dashv @<4pt>[d] & G@{}[d]|\dashv @<4pt>[d] \\ & \widehat{G}^{\prime }[r]_{\widehat{F}}@<4pt>[u] & \widehat{G} @<4pt>[u]\\ & \widehat{H}[u]@/_1pc/...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.06019650772213936, 0.0014454178744927049, -0.001317656715400517, 0.013302421197295189, -0.012196428142488003, -0.05452162027359009, 0.023767398670315742, 0.09384918957948685, -0.007574142422527075, 0.009824264794588089, -0.02921346016228199, -0.011105691082775593, -0.011143828742206097, ...
7f7ec8c4e398430882572aa5500fe4d58e7d3562
subsection
46
95
Yoneda Structures
In the diagram { G^{\prime }@/_2pc/[dd]_{y_{G^{\prime }}} [d]_\ell & G[l]_q [d]^{y_G}\\ A@<-4pt>@{^{(}->}[r]_i & G@<-4pt>[l]_L@{}[l]|\perp @{.>}@/^1pc/[dl]^\Sigma \\ G^{\prime }@{.>}[u]^\Lambda } -cocompleteness properties imply the existence of 1-cells \Lambda = \text{Yan}_{G^{\prime }}(\ell ) : G^{\prime }\rightar...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.040070854127407074, -0.014931200072169304, -0.01482438575476408, -0.020752614364027977, 0.014168236404657364, -0.07458733767271042, 0.025284618139266968, 0.03521840646862984, -0.01367994025349617, 0.026459582149982452, -0.03512685000896454, -0.02220224402844906, -0.02198861539363861, 0....
2fdf9e7a7d133a014e0e282d902e3444fed6b958
subsection
47
95
Yoneda Structures
Examples Example (Categories and the \lambda -Pres doctrine) In the 2-category of categories, functors, and natural transformations, the canonical Yoneda structure of REF having A = [A^\mathrm {op},\text{\fontseries {b}\selectfont {\upshape Set}}] yields notions of accessible and presentable that coincide with the cla...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1017/cbo9780511600579", "end": 500, "openalex_id": "https://openalex.org/W1595870841", "raw": "J. Adámek and J. Rosický, Locally presentable and accessible categories, London Mathematical Society Lecture Note Series, vol. 189, Cambridge ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.026687784120440483, 0.019058343023061752, -0.01625070907175541, 0.028839286416769028, -0.004299189895391464, -0.023086687549948692, 0.009193476289510727, 0.05871617794036865, 0.010109009221196175, 0.03164692223072052, -0.02403273805975914, 0.04486111178994179, -0.01583871990442276, 0.00...
12d194c9a7a25e2b9059ad7cc170c443349beda7
subsection
48
95
Yoneda Structures
The notion of accessible and presentable object in the 2-category of -enriched categories, -enriched functors and -natural transformations, with its natural Yoneda structure having A = [A^\mathrm {op},] was first outlined in , , ; more in detail, the first two papers establish the theory of accessibility, and the last ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1017/s0004972700021900", "end": 381, "openalex_id": "https://openalex.org/W2070302638", "raw": "F. Borceux and C. Quinteiro, Enriched accessible categories, Bulletin of the Australian Mathematical Society 54 (1996), no. 3, 489–501.", ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.021635599434375763, 0.03152266889810562, -0.004722297191619873, 0.03881591185927391, 0.00018607397214509547, -0.05489766225218773, -0.00301723531447351, 0.042355727404356, 0.02226116880774498, 0.030775036662817, -0.025999337434768677, 0.015944428741931915, -0.0020407342817634344, -0.007...
cd95526a55b1054895fb60be0ed57c2289a8f5d4
subsection
49
95
Yoneda Structures
It is an interesting fact that the whole context \text{\begin{}{UTF8}{min}よ\end{}}_{\textsc {c},\lambda } : {I\hspace{-1.49994pt}n\hspace{-1.00006pt}d}_\lambda \Rightarrow restricts to this framework, as the convolution of two functors that are \lambda -filtered colimits of representables (say, on filtered categories I...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/0021-8693(78)90160-6", "end": 2112, "openalex_id": "https://openalex.org/W2031120504", "raw": "R. Street and R. Walters, Yoneda structures on 2-categories, J. Algebra 50 (1978), no. 2, 350–379.", "source_ref_id": "1e3c613aa32e...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.06087367236614227, 0.02102353796362877, -0.007887640967965126, 0.04427453503012657, 0.022152524441480637, -0.03789729252457619, -0.02604294754564762, 0.05217743292450905, 0.002744273515418172, 0.030772479251027107, -0.012968075461685658, 0.003777905600145459, -0.023968053981661797, 0.00...
39b16165ca14529b710d5691bdcb390303b27f5f
subsection
50
95
Yoneda Structures
In particular For a \infty -category, or more generally a simplicial set, filteredness is captured as a lifting property against certain cofibrations (T.5.3.1.7) and moreover this property is equivalent (T.5.3.1.13) to a property of topologically enriched categories. \lambda -accessible and \lambda -presentable \inft...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/j.aim.2015.04.021", "end": 1331, "openalex_id": "https://openalex.org/W2963131328", "raw": "E. Riehl and D. Verity, The 2-category theory of quasi-categories, Advances in Mathematics 280 (2015), 549–642.", "source_ref_id": "f0...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.0883079543709755, -0.011847119778394699, 0.015119762159883976, 0.0023781966883689165, 0.006369829177856445, -0.030559923499822617, -0.018857745453715324, 0.0322839729487896, 0.03170420229434967, 0.04198747128248215, 0.002759623574092984, 0.01768295094370842, -0.015012962743639946, 0.008...
2a18283effc962c06e3190c591328746500e20fd
subsection
51
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Yoneda Structures
Our conjecture here is that derivator theory homes a theory of accessibility and presentability mainly because the 2-category \protect {\underline{\text{\fontseries {b}\selectfont {\upshape PDer}}}} (and its subcategory \protect {\underline{\text{\fontseries {b}\selectfont {\upshape Der}}}} of derivators) possesses a s...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/0022-4049(81)90021-9", "end": 1327, "openalex_id": "https://openalex.org/W2060119423", "raw": ", Conspectus of variable categories, Journal of Pure and Applied Algebra 21 (1981), no. 3, 307–338.", "source_ref_id": "e22db0efdde...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.038216300308704376, -0.027487043291330338, -0.0167425237596035, 0.05036493018269539, 0.005208191927522421, -0.055004607886075974, -0.013064357452094555, 0.05277634412050247, 0.017139337956905365, 0.026861296966671944, -0.025762425735592842, 0.021519562229514122, -0.04477900266647339, -0...
d185719b0fd410d4632eafc023a9b71df53f1957
subsection
52
95
Yoneda Structures
The Cisinski-Tabuada Yoneda structure, (following ; there, the authors prove that for every stable derivator there is an action \text{\fontseries {b}\selectfont {\upshape Sp}}\times \rightarrow that can be promoted to a two-variable adjunction, using Brown representability). The internal-hom part of this two-variable a...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 277, "openalex_id": "", "raw": "Denis-Charles Cisinski and Gonçalo Tabuada, Non-connective K-theory via universal invariants, Compos. Math. 147 (2011), no. 4, 1281–1320.", "source_ref_id": "0d9d29e1e8902b68471b06f7d978216a1f...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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25176d7903e3286aee12fe6cd4670e73380f6f47
subsection
53
95
Accessibility and presentability
In light of the previous two remarks, the following definition appears straighforward.Definition (\text{\begin{}{UTF8}{min}よ\end{}}-accessible object) Let \text{\begin{}{UTF8}{min}よ\end{}} be a context on the 2-category ; A\in is \text{\begin{}{UTF8}{min}よ\end{}}-accessible if there exists a -small object G\in such th...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.04092643782496452, 0.0024072129745036364, -0.004204038996249437, 0.04040760546922684, 0.012856272049248219, -0.048342637717723846, -0.003523076418787241, 0.03720307722687721, 0.020829450339078903, 0.03216738626360893, -0.01934926211833954, 0.0018349753227084875, -0.002163058379665017, 0...
1fbe413c9a557f3591aa9f851e1b2fae1420cb73
subsection
54
95
Accessibility and presentability
Definition (\text{\begin{}{UTF8}{min}よ\end{}}-presentable object) Let \text{\begin{}{UTF8}{min}よ\end{}} be a context; A\in is \text{\begin{}{UTF8}{min}よ\end{}}-presentable if p A is a left split subobject of G for some G; A is \text{\begin{}{UTF8}{min}よ\end{}}-accessible; The fully faithful functor i : A\rightarr...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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c4a667ccd181e612eb4ab06177c63a2dbc0ef865
subsection
55
95
Accessibility and presentability
We shall focus on the following diagram. { \bar{G} [r]^\ell [dr]_{y^{}_{\bar{G}} }& (G) [r]^i & G^{\prime } \\ & \bar{G} [u]_{L} [ur]_{\text{Yan}_G(\ell i)}& } By assumption, i\cong \text{Yan}_G(i y_G), and this extension is pointwise; since has finite limits, we can build the comma object (\ell /y_G), and the resul...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1017/cbo9780511600579", "end": 2185, "openalex_id": "https://openalex.org/W1595870841", "raw": "J. Adámek and J. Rosický, Locally presentable and accessible categories, London Mathematical Society Lecture Note Series, vol. 189, Cambridge...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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70d3378a6f5b7d518c5c234704995b8a617abc30
subsection
56
95
Accessibility and presentability
To show that A is cocomplete, we can appeal the easy result that reflective subobjects of -cocomplete objects remain -cocomplete. This concludes the first implication. Now assume that A is accessible; we shall show that the axioms REF –REF hold. Since A is -cocomplete, i has a left adjoint; REF is part of the assumptio...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.058313265442848206, 0.008566954173147678, -0.014959747903048992, 0.011069145984947681, -0.0025555919855833054, -0.04729752242565155, -0.005057783331722021, 0.02961435168981552, 0.015127577818930149, 0.006205892655998468, -0.010603799484670162, 0.0017498175147920847, -0.004794595297425985,...
29d3a2a4c293deae2150613472e3f19216010ab0
subsection
57
95
Accessibility and presentability
In particular this means that the diagram @R=5mm@C=5mm{ A[rr]^{y^{}_A}[dd]_{\iota _A} && A \\ &(\widehat{A})@{=}[ur]\\ \widehat{A} [ur]_{y^{}_{\widehat{A}}} } commutes. Moreover, for every \widehat{(\,\rule {}{}\,)}-cell f : G\rightarrow G^{\prime } between \widehat{(\,\rule {}{}\,)}-cocomplete objects, there exists...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.037079818546772, 0.01692243665456772, -0.005901489872485399, -0.013283120468258858, 0.023880623281002045, -0.061128292232751846, -0.03833107277750969, 0.015686441212892532, -0.03942973166704178, 0.015640664845705032, -0.03570649400353432, -0.006366895046085119, -0.0037060745526105165, 0...
d2ce1393964aec99b027ecaf8ca3fc9c6a73fb10
subsection
58
95
Accessibility and presentability
Formal Gabriel-Ulmer duality (the present terse but very clear introduction to Gabriel-Ulmer duality comes from ) Gabriel-Ulmer duality builds an a biequivalence \textsf {Mod} : \underline{\text{Lex}}^\mathrm {op}\leftrightarrows \underline{\text{LFP}} : \textsf {Th} between the 2-category of small finitely complete ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 529, "openalex_id": "", "raw": "The nLab, Gabriel-ulmer duality, https://ncatlab.org/nlab/revision/Gabriel-Ulmer+duality/11, February 22, 2018.", "source_ref_id": "7c6358c39ef12a001c6b8ff259c1e10d10d142a4", "start": 0 ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.07001256197690964, -0.014969992451369762, -0.013253250159323215, 0.01904439367353916, -0.01745736226439476, -0.012345284223556519, 0.0028135499451309443, 0.06039880961179733, 0.010468312539160252, 0.02261521853506565, -0.03531148284673691, 0.007416326552629471, -0.029665306210517883, -0...
cf1abfce04c943bfe0e4aa467e4a33f0e6de5728
subsection
59
95
Accessibility and presentability
Theorem (Gabriel Hypothesis Ulmer duality) Let \text{\begin{}{UTF8}{min}よ\end{}}: \Rightarrow be a context on , with climbable and assume that there exist a gu envelope relative to \text{\begin{}{UTF8}{min}よ\end{}}. There is a biadjunction \text{\begin{}{UTF8}{min}よ\end{}}\textsf {-Mod}: \text{L\hspace{-1.66702pt}Ê}...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 495, "openalex_id": "https://openalex.org/W1557248512", "raw": "G.M. Kelly, Structures defined by finite limits in the enriched context, I, Cahiers de topologie et géométrie différentielle catégoriques 23 (1982), no. 1, 3–42.", ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.08820556104183197, 0.0028498941101133823, 0.009224958717823029, 0.011582702398300171, -0.002367281587794423, -0.007519599981606007, -0.007790473755449057, 0.05447990447282791, 0.00585620803758502, 0.0048604621551930904, -0.025103485211730003, -0.003399271285161376, -0.011346165090799332, ...
a2d6d9873413a93b72b9abbf33e91e22efab5c8c
subsection
60
95
Accessibility and presentability
We start defining the action of the functors \text{\begin{}{UTF8}{min}よ\end{}}\textsf {-Mod} and \text{\begin{}{UTF8}{min}よ\end{}}\textsf {-Th}; the first is defined “applying ”, in the sense that its action on 0- and 1-cells is as follows: { G @[lightgray]@{^{(}->}@<-4pt>[r]_{\color {lightgray} i_G} & \color {lightg...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.017150234431028366, -0.019118545576930046, -0.03161502256989479, 0.027983568608760834, -0.014609741978347301, -0.044828638434410095, 0.007564260624349117, 0.049955397844314575, -0.025343896821141243, 0.008773474022746086, -0.05535680800676346, -0.0323779359459877, -0.0034769659396260977, ...
e5d80714192b148146bd1561c11293cf3b49024b
subsection
61
95
Accessibility and presentability
We have to check that this really defines a functor taking values in \textsc {Pr}(\text{\begin{}{UTF8}{min}よ\end{}}); this is easily seen, as every G is -cocomplete (it's a reflection of X for a suitable X), and each F is an -cell since in the diagram { G @{}[drr]|\rotatebox [origin=c]{225}{\Rightarrow }[dr]^F @/^1pc/...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.028078434988856316, -0.016908101737499237, -0.030474256724119186, 0.00811832956969738, 0.035037003457546234, -0.06677784025669098, 0.028383634984493256, 0.012307205237448215, -0.012131715193390846, 0.020250044763088226, -0.046726178377866745, -0.01893768273293972, -0.019761724397540092, ...
01e29697aad9aad91e7766ca02a4ac9e704bc1db
subsection
62
95
Accessibility and presentability
We need to check that this is a \widehat{(\,\rule {}{}\,)}-cell, and in order to do this we consider the diagram { H[r]^\ell @/_1.5pc/[ddr]_{y_H} & G^{\prime }[r]^F @{}[d]|\dashv @<4pt>[d] & G@{}[d]|\dashv @<4pt>[d] \\ & \widehat{G}^{\prime }[r]_{\widehat{F}}@<4pt>[u] & \widehat{G} @<4pt>[u]\\ & \widehat{H}[u]@/_1pc/...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.06019650772213936, 0.0014454178744927049, -0.001317656715400517, 0.013302421197295189, -0.012196428142488003, -0.05452162027359009, 0.023767398670315742, 0.09384918957948685, -0.007574142422527075, 0.009824264794588089, -0.02921346016228199, -0.011105691082775593, -0.011143828742206097, ...
ec3a3bdee7f9fde58067e7449fa3d4e0f8992754
subsection
63
95
Accessibility and presentability
In the diagram { G^{\prime }@/_2pc/[dd]_{y_{G^{\prime }}} [d]_\ell & G[l]_q [d]^{y_G}\\ A@<-4pt>@{^{(}->}[r]_i & G@<-4pt>[l]_L@{}[l]|\perp @{.>}@/^1pc/[dl]^\Sigma \\ G^{\prime }@{.>}[u]^\Lambda } -cocompleteness properties imply the existence of 1-cells \Lambda = \text{Yan}_{G^{\prime }}(\ell ) : G^{\prime }\rightar...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.040070854127407074, -0.014931200072169304, -0.01482438575476408, -0.020752614364027977, 0.014168236404657364, -0.07458733767271042, 0.025284618139266968, 0.03521840646862984, -0.01367994025349617, 0.026459582149982452, -0.03512685000896454, -0.02220224402844906, -0.02198861539363861, 0....
e0500f00a0abcc6ea4f28163da55abf80ca3032f
subsection
64
95
Accessibility and presentability
Examples Example (Categories and the \lambda -Pres doctrine) In the 2-category of categories, functors, and natural transformations, the canonical Yoneda structure of REF having A = [A^\mathrm {op},\text{\fontseries {b}\selectfont {\upshape Set}}] yields notions of accessible and presentable that coincide with the cla...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1017/cbo9780511600579", "end": 500, "openalex_id": "https://openalex.org/W1595870841", "raw": "J. Adámek and J. Rosický, Locally presentable and accessible categories, London Mathematical Society Lecture Note Series, vol. 189, Cambridge ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.026687784120440483, 0.019058343023061752, -0.01625070907175541, 0.028839286416769028, -0.004299189895391464, -0.023086687549948692, 0.009193476289510727, 0.05871617794036865, 0.010109009221196175, 0.03164692223072052, -0.02403273805975914, 0.04486111178994179, -0.01583871990442276, 0.00...
aa689b603be5b3ba98a1aa0d3c0f2c180e84e2b5
subsection
65
95
Accessibility and presentability
The notion of accessible and presentable object in the 2-category of -enriched categories, -enriched functors and -natural transformations, with its natural Yoneda structure having A = [A^\mathrm {op},] was first outlined in , , ; more in detail, the first two papers establish the theory of accessibility, and the last ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1017/s0004972700021900", "end": 381, "openalex_id": "https://openalex.org/W2070302638", "raw": "F. Borceux and C. Quinteiro, Enriched accessible categories, Bulletin of the Australian Mathematical Society 54 (1996), no. 3, 489–501.", ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.021635599434375763, 0.03152266889810562, -0.004722297191619873, 0.03881591185927391, 0.00018607397214509547, -0.05489766225218773, -0.00301723531447351, 0.042355727404356, 0.02226116880774498, 0.030775036662817, -0.025999337434768677, 0.015944428741931915, -0.0020407342817634344, -0.007...
a8e509164a18e29baac3995ed510330871658496
subsection
66
95
Accessibility and presentability
It is an interesting fact that the whole context \text{\begin{}{UTF8}{min}よ\end{}}_{\textsc {c},\lambda } : {I\hspace{-1.49994pt}n\hspace{-1.00006pt}d}_\lambda \Rightarrow restricts to this framework, as the convolution of two functors that are \lambda -filtered colimits of representables (say, on filtered categories I...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/0021-8693(78)90160-6", "end": 2112, "openalex_id": "https://openalex.org/W2031120504", "raw": "R. Street and R. Walters, Yoneda structures on 2-categories, J. Algebra 50 (1978), no. 2, 350–379.", "source_ref_id": "1e3c613aa32e...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.06087367236614227, 0.02102353796362877, -0.007887640967965126, 0.04427453503012657, 0.022152524441480637, -0.03789729252457619, -0.02604294754564762, 0.05217743292450905, 0.002744273515418172, 0.030772479251027107, -0.012968075461685658, 0.003777905600145459, -0.023968053981661797, 0.00...
ead803f7059aa510aadafcd39e7b1506ad0bf8f5
subsection
67
95
Accessibility and presentability
In particular For a \infty -category, or more generally a simplicial set, filteredness is captured as a lifting property against certain cofibrations (T.5.3.1.7) and moreover this property is equivalent (T.5.3.1.13) to a property of topologically enriched categories. \lambda -accessible and \lambda -presentable \inft...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/j.aim.2015.04.021", "end": 1331, "openalex_id": "https://openalex.org/W2963131328", "raw": "E. Riehl and D. Verity, The 2-category theory of quasi-categories, Advances in Mathematics 280 (2015), 549–642.", "source_ref_id": "f0...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.0883079543709755, -0.011847119778394699, 0.015119762159883976, 0.0023781966883689165, 0.006369829177856445, -0.030559923499822617, -0.018857745453715324, 0.0322839729487896, 0.03170420229434967, 0.04198747128248215, 0.002759623574092984, 0.01768295094370842, -0.015012962743639946, 0.008...
99548176da2403ef5f5002191de0cc08b98c076b
subsection
68
95
Accessibility and presentability
Our conjecture here is that derivator theory homes a theory of accessibility and presentability mainly because the 2-category \protect {\underline{\text{\fontseries {b}\selectfont {\upshape PDer}}}} (and its subcategory \protect {\underline{\text{\fontseries {b}\selectfont {\upshape Der}}}} of derivators) possesses a s...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/0022-4049(81)90021-9", "end": 1327, "openalex_id": "https://openalex.org/W2060119423", "raw": ", Conspectus of variable categories, Journal of Pure and Applied Algebra 21 (1981), no. 3, 307–338.", "source_ref_id": "e22db0efdde...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.038216300308704376, -0.027487043291330338, -0.0167425237596035, 0.05036493018269539, 0.005208191927522421, -0.055004607886075974, -0.013064357452094555, 0.05277634412050247, 0.017139337956905365, 0.026861296966671944, -0.025762425735592842, 0.021519562229514122, -0.04477900266647339, -0...
b058a123d894e372ecd91e29ed2fe29a10f1eac3
subsection
69
95
Accessibility and presentability
The Cisinski-Tabuada Yoneda structure, (following ; there, the authors prove that for every stable derivator there is an action \text{\fontseries {b}\selectfont {\upshape Sp}}\times \rightarrow that can be promoted to a two-variable adjunction, using Brown representability). The internal-hom part of this two-variable a...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 277, "openalex_id": "", "raw": "Denis-Charles Cisinski and Gonçalo Tabuada, Non-connective K-theory via universal invariants, Compos. Math. 147 (2011), no. 4, 1281–1320.", "source_ref_id": "0d9d29e1e8902b68471b06f7d978216a1f...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.0715302899479866, 0.013289863243699074, -0.019774584099650383, 0.06222280487418175, 0.0015162803465500474, -0.07055376470088959, 0.009948325343430042, 0.029295681044459343, 0.014640211127698421, 0.031096143648028374, -0.015166617929935455, 0.002735026413574815, -0.02735789306461811, -0....
e3e5f487d042c82653540cf1d7c10d2f8d3786d9
subsection
70
95
Gabriel-Ulmer duality
We start with the simple observation that the closure under finite colimits of A\in \protect {\underline{\text{\fontseries {b}\selectfont {\upshape Cat}}}} is the subcategory of [A^\mathrm {op},\text{\fontseries {b}\selectfont {\upshape Set}}] generated by finite colimits of representables; we call this category \wideh...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.04104944318532944, -0.002390099922195077, -0.007076832465827465, 0.03375515714287758, -0.008034398779273033, -0.06744927167892456, -0.07556760311126709, 0.042911164462566376, -0.0007749226642772555, 0.023378344252705574, -0.01117033138871193, -0.023103663697838783, 0.027040747925639153, ...
39435a8d9681aeca2217d000aecb26354116955d
subsection
71
95
Gabriel-Ulmer duality
Moreover, for every \widehat{(\,\rule {}{}\,)}-cell f : G\rightarrow G^{\prime } between \widehat{(\,\rule {}{}\,)}-cocomplete objects, there exists a 1-cell f in diagram{ G[dr]^{y_G^{}}[rrr]^f [dd]_{y_G^{}} &&& G^{\prime } [dd]^{y_{G^{\prime }}^{}}[dl]_{y_{G^{\prime }}^{}}\\ & G[dl]^{\text{\begin{}{UTF8}{min}よ\end{}}_...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.04031819477677345, 0.003971540369093418, -0.002065887674689293, -0.01831257902085781, 0.02446255274116993, -0.0698930099606514, -0.015374935232102871, 0.02119680866599083, -0.040257152169942856, 0.0074547454714775085, -0.039829857647418976, -0.015344414860010147, -0.005200009327381849, ...
def61d4aff52bc045aed808bf50d9c607f5d4c8b
subsection
72
95
Formal Gabriel-Ulmer duality
(the present terse but very clear introduction to Gabriel-Ulmer duality comes from ) Gabriel-Ulmer duality builds an a biequivalence\textsf {Mod} : \underline{\text{Lex}}^\mathrm {op}\leftrightarrows \underline{\text{LFP}} : \textsf {Th}between the 2-category of small finitely complete categories, finite limit preservi...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 496, "openalex_id": "", "raw": "The nLab, Gabriel-ulmer duality, https://ncatlab.org/nlab/revision/Gabriel-Ulmer+duality/11, February 22, 2018.", "source_ref_id": "7c6358c39ef12a001c6b8ff259c1e10d10d142a4", "start": 0 ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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fde67848ada1c079e274f7fb70ae3b5692ef688b
subsection
73
95
Formal Gabriel-Ulmer duality
We define the 2-category \text{L\hspace{-1.66702pt}Ê}\hspace{-1.25pt}X(UTF8minよ) having 0-cells the (  )-cocomplete objects, 1-cells the (  )-cells, and all 2-cells between these.Definition (The category \textsc {Pr}({\text{\begin{}{UTF8}{min}よ\end{}}})) The objects of the 2-category \textsc {Pr}({\text{\begin{}{UTF8}...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.03888624534010887, -0.011797121725976467, -0.011339277029037476, 0.031713347882032394, 0.015024924650788307, -0.035956040024757385, 0.0053567783907055855, 0.036627545952796936, -0.012911209836602211, 0.00017336083692498505, -0.02171708270907402, 0.007680338341742754, -0.015017293393611908...
870b459d8146b0aa7ffce1742fee45f54c273e17
subsection
74
95
Formal Gabriel-Ulmer duality
There is a biadjunction\text{\begin{}{UTF8}{min}よ\end{}}\textsf {-Mod}: \text{L\hspace{-1.66702pt}Ê}\hspace{-1.25pt}X(UTF8minよ) Pr(UTF8minよ) : UTF8minよ-Th which is in fact a biequivalence of 2-categories.Our argument will be identical in spirit to the one offered in .We start defining the action of the functors \text{\...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 268, "openalex_id": "https://openalex.org/W1557248512", "raw": "G.M. Kelly, Structures defined by finite limits in the enriched context, I, Cahiers de topologie et géométrie différentielle catégoriques 23 (1982), no. 1, 3–42.", ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.05252663046121597, -0.03071938082575798, -0.020525367930531502, 0.010644196532666683, -0.003116956679150462, -0.026019148528575897, 0.0091944495216012, 0.05899708345532417, -0.014344867318868637, 0.010712869465351105, -0.05600602552294731, -0.024401534348726273, -0.003803679021075368, -...
f159ea2a2854c6dd206e662016ecb13cab48c9bc
subsection
75
95
Formal Gabriel-Ulmer duality
We have to check that this really defines a functor taking values in \textsc {Pr}(\text{\begin{}{UTF8}{min}よ\end{}}); this is easily seen, as every G is -cocomplete (it's a reflection of X for a suitable X), and each F is an -cell since in the diagram{ G @{}[drr]|\rotatebox [origin=c]{225}{\Rightarrow }[dr]^F @/^1pc/[d...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.02746632695198059, -0.01725800894200802, -0.03013666346669197, 0.008217008784413338, 0.03552311658859253, -0.06390498578548431, 0.02906852774322033, 0.01248954888433218, -0.011146750301122665, 0.017685262486338615, -0.04769985377788544, -0.01718171313405037, -0.016754459589719772, 0.037...
7afde3665282b185347372c9d03427f31433d249
subsection
76
95
Formal Gabriel-Ulmer duality
We need to check that this is a \widehat{(\,\rule {}{}\,)}-cell, and in order to do this we consider the diagram{ H[r]^\ell @/_1.5pc/[ddr]_{y_H} & G^{\prime }[r]^F @{}[d]|\dashv @<4pt>[d] & G@{}[d]|\dashv @<4pt>[d] \\ & \widehat{G}^{\prime }[r]_{\widehat{F}}@<4pt>[u] & \widehat{G} @<4pt>[u]\\ & \widehat{H}[u]@/_1pc/[ur...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.03972883149981499, -0.004416857846081257, 0.002050139009952545, -0.017179211601614952, -0.00913885235786438, -0.04671647027134895, 0.012876779772341251, 0.06713013350963593, -0.008955770172178745, 0.017423320561647415, -0.03921009972691536, -0.01600443385541439, 0.0033298071939498186, 0...
9799d90e832608d11e421ca75573c2ec7ab49039
subsection
77
95
Exchange and domination
GabrielHypothesis Ulmer contexts are richer structures than it can appear at first sight: it is indeed possible to show that the existence of a gu envelope relative to a context \text{\begin{}{UTF8}{min}よ\end{}} is really near to a necessary and sufficient condition for the distinction between presentabilities REF and ...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.05461564287543297, -0.008863599970936775, -0.0021167376544326544, 0.03252529352903366, -0.023432856425642967, -0.0464690662920475, 0.025766989216208458, 0.07145801186561584, 0.015988042578101158, 0.013867491856217384, -0.023448113352060318, -0.018886638805270195, -0.0034859427250921726, ...
61ead03bd9094b2f3b89cb25a195517a1297e573
subsection
78
95
Exchange and domination
We claim that A \cong G^{\prime }.In the diagram{ G^{\prime }@/_2pc/[dd]_{y_{G^{\prime }}} [d]_\ell & G[l]_q [d]^{y_G}\\ A@<-4pt>@{^{(}->}[r]_i & G@<-4pt>[l]_L@{}[l]|\perp @{.>}@/^1pc/[dl]^\Sigma \\ G^{\prime }@{.>}[u]^\Lambda }-cocompleteness properties imply the existence of 1-cells \Lambda = \text{Yan}_{G^{\prime }}...
{ "cite_spans": [] }
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.02065958082675934, -0.006931029725819826, -0.0152963288128376, -0.027861442416906357, 0.012351499870419502, -0.0729951485991478, 0.012687179259955883, 0.03826752305030823, -0.007240008097141981, 0.022078590467572212, -0.04128864407539368, -0.02078164555132389, -0.016906067728996277, 0.0...
d9b86d8dfbb8975f738f49fb0c2793387a350c92
subsection
79
95
Examples
Example (Categories and the \lambda -Pres doctrine) In the 2-category of categories, functors, and natural transformations, the canonical Yoneda structure of REF having A = [A^\mathrm {op},\text{\fontseries {b}\selectfont {\upshape Set}}] yields notions of accessible and presentable that coincide with the classical no...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1017/cbo9780511600579", "end": 491, "openalex_id": "https://openalex.org/W1595870841", "raw": "J. Adámek and J. Rosický, Locally presentable and accessible categories, London Mathematical Society Lecture Note Series, vol. 189, Cambridge ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.028595883399248123, 0.011398679576814175, -0.013870682567358017, 0.031373072415590286, -0.001979891210794449, -0.02954195998609066, 0.0024281323421746492, 0.0605182908475399, 0.014000385999679565, 0.029236773028969765, -0.02645958587527275, 0.04263442009687424, -0.011894606053829193, 0....
5398d2c6acdf1f50c6074e865b6d46fcb5f43f02
subsection
80
95
Examples
The notion of accessible and presentable object in the 2-category of -enriched categories, -enriched functors and -natural transformations, with its natural Yoneda structure having A = [A^\mathrm {op},] was first outlined in , , ; more in detail, the first two papers establish the theory of accessibility, and the last ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1017/s0004972700021900", "end": 380, "openalex_id": "https://openalex.org/W2070302638", "raw": "F. Borceux and C. Quinteiro, Enriched accessible categories, Bulletin of the Australian Mathematical Society 54 (1996), no. 3, 489–501.", ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.02677549049258232, 0.02570752240717411, -0.0011385305551812053, 0.035120900720357895, 0.004371041897684336, -0.05934852361679077, -0.0056602321565151215, 0.044457994401454926, 0.021038975566625595, 0.03624989464879036, -0.021252568811178207, 0.012579141184687614, -0.003592950524762273, ...
4978fd63f71c4a36360d76f3ebdb9763bf5388a3
subsection
81
95
Examples
It is an interesting fact that the whole context \text{\begin{}{UTF8}{min}よ\end{}}_{\textsc {c},\lambda } : {I\hspace{-1.49994pt}n\hspace{-1.00006pt}d}_\lambda \Rightarrow restricts to this framework, as the convolution of two functors that are \lambda -filtered colimits of representables (say, on filtered categories I...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/0021-8693(78)90160-6", "end": 2108, "openalex_id": "https://openalex.org/W2031120504", "raw": "R. Street and R. Walters, Yoneda structures on 2-categories, J. Algebra 50 (1978), no. 2, 350–379.", "source_ref_id": "1e3c613aa32e...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.04537726566195488, 0.013953432440757751, -0.004173060413450003, 0.03094320558011532, 0.022322440519928932, -0.030439691618084908, -0.02598435804247856, 0.04488900676369667, 0.005954430904239416, 0.04110502824187279, -0.005168644245713949, 0.01579201966524124, -0.02120860666036606, 0.012...
8fe3083c8f35bfc454baed09a6fe64afac05ea31
subsection
82
95
Examples
Then a Yoneda structure on can be transferred to using the coreflector 2-functor: under suitable assumptions on the 2-categories and the monad, this yields that (for example) a Yoneda structure, and a Yoneda context on lift to the category of algebras = T\text{-Alg} of an idempotent 2-monad on .Example (Categories and ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1017/cbo9780511600579", "end": 790, "openalex_id": "https://openalex.org/W1595870841", "raw": "J. Adámek and J. Rosický, Locally presentable and accessible categories, London Mathematical Society Lecture Note Series, vol. 189, Cambridge ...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.031835075467824936, 0.015184995718300343, -0.012773710303008556, 0.039068933576345444, -0.0014746233355253935, -0.032445527613162994, -0.019915999844670296, 0.05130849778652191, 0.0035406220704317093, 0.019641296938061714, -0.028920168057084084, 0.01514684222638607, -0.008988907560706139,...
3f88fc1fb23d7ccddcec4132423e44ad533c34f5
subsection
83
95
Examples
The locally presentable objects in this Yoneda structure are the algebraic lattices in the sense of , while the accessible objects are “accessible posets” (there does not seem to be a name for these categories, but they are simply posetal categories that are accessible in \protect {\underline{\text{\fontseries {b}\sele...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1007/s00012-011-0129-0", "end": 389, "openalex_id": "https://openalex.org/W2127249478", "raw": "H.E. Porst, Algebraic lattices and locally finitely presentable categories, Algebra universalis 65 (2011), no. 3, 285–298.", "source_re...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.0405595637857914, 0.01908954605460167, -0.005470505449920893, 0.0403764508664608, 0.0029469772707670927, -0.042940035462379456, 0.014221788384020329, 0.06305196136236191, 0.02075282484292984, 0.03628692403435707, -0.029694849625229836, 0.03006107546389103, -0.02882506139576435, -0.01095...
292ab69282387023ee88c0f6b2f79209f879363a
subsection
84
95
Examples
The former example specializes to this context, but -enriched Ind-completion, the gu envelope and the representation theorem do not seem (to the best of our knowledge) to admit a topological characterization. given an additive category , regarded as a particular preadditive (=\text{\fontseries {b}\selectfont {\upshape...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 978, "openalex_id": "", "raw": "N. Popescu and P. Gabriel, Caractérisation des catégories abéliennes avec générateurs et limites inductives exactes, C.R. Acad. Sci. Paris 258 (1964), 4188–4190.", "source_ref_id": "5485a02dd2...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.02306847646832466, 0.02956792712211609, 0.005866289138793945, 0.03637251630425453, 0.0017211722442880273, -0.09428782016038895, -0.01490601897239685, 0.06279751658439636, 0.007571250665932894, 0.0288203377276659, -0.017331870272755623, 0.002744340104982257, -0.011412182822823524, -0.004...
0e9d5fd5e6131c40bd62a7cb431306c6d5135664
subsection
85
95
Examples
It is enticing to conjecture how slight variations on this theme can lead to unexpected (or even new) results, unveiling a deeper and wider pattern for accessibility and presentability phenomena: among many other cases of interest we recordthe case of finitely complete categories, left exact left adjoints and natural t...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/0021-8693(78)90160-6", "end": 1074, "openalex_id": "https://openalex.org/W2031120504", "raw": "R. Street and R. Walters, Yoneda structures on 2-categories, J. Algebra 50 (1978), no. 2, 350–379.", "source_ref_id": "1e3c613aa32e...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.0367073118686676, 0.004634183831512928, -0.007441393099725246, 0.031092893332242966, 0.007204916328191757, -0.012975714169442654, -0.0052330042235553265, 0.03554781153798103, 0.005675444845110178, 0.025051292032003403, -0.02267126552760601, 0.020230215042829514, -0.03136751055717468, 0....
d6f865e0af92cff9a61c8c3c07438954604c4c0b
subsection
86
95
The case of
An extensive treatment of accessibility and presentability in the realm of quasicategories occupies ( is called simply “T” from now on): a general motif of the chapter is that the classical theory carries over with slight or no change at all in the \infty -categorical setting. In particularFor a \infty -category, or mo...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 278, "openalex_id": "https://openalex.org/W1680171265", "raw": "J. Lurie, Higher Topos Theory, Annals of Mathematics Studies, vol. 170, Princeton University Press, Princeton, NJ, 2009.", "source_ref_id": "67b92cedefd2f86e0cf...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.06200658902525902, 0.0018862118013203144, -0.00557281170040369, 0.019377058371901512, 0.009276576340198517, -0.033780165016651154, -0.0037380941212177277, 0.03768609091639519, 0.0381438173353672, 0.04223283380270004, 0.008589987643063068, -0.004832821432501078, -0.00665609585121274, 0.0...
01749bb191b2ffac328b581af45a061b27ab06d2
subsection
87
95
The case of
T.5.3.5.10 shows that there exists a gu envelope given by the equivalence between A (=\infty -functors to the \infty -category of spaces) and the \lambda -filtered colimit completion of A\in \text{\fontseries {b}\selectfont {\upshape QCat}}.The onerous exercise is style of re-reading REF with \infty -goggles (not an ex...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/j.aim.2015.04.021", "end": 806, "openalex_id": "https://openalex.org/W2963131328", "raw": "E. Riehl and D. Verity, The 2-category theory of quasi-categories, Advances in Mathematics 280 (2015), 549–642.", "source_ref_id": "f07...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.08546982705593109, 0.00203563179820776, 0.0027033649384975433, 0.008112003095448017, 0.015590612776577473, -0.03998767212033272, -0.013232560828328133, 0.02622092328965664, 0.027350345626473427, 0.03678255155682564, 0.006108803674578667, -0.013896478340029716, 0.0004123251710552722, 0.0...
5c87e598543d1ef9f495c56f604c2b41579f25af
subsection
88
95
The case of
In view of 's claim that the category theory of \text{\fontseries {b}\selectfont {\upshape QCat}} is faithfully captured by a 2-dimensional theory, this structure can be now transported to a honest Yoneda structure on this 2-category \text{\fontseries {b}\selectfont {\upshape QCat}}_2.Passed under this correspondence, ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1016/j.aim.2015.04.021", "end": 286, "openalex_id": "https://openalex.org/W2963131328", "raw": "E. Riehl and D. Verity, The 2-category theory of quasi-categories, Advances in Mathematics 280 (2015), 549–642.", "source_ref_id": "f07...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.04222496226429939, 0.008268037810921669, 0.00867991428822279, 0.025887196883559227, -0.017954761162400246, -0.02844998426735401, -0.011105408892035484, 0.03285858780145645, 0.01097574457526207, 0.022165054455399513, 0.01601741649210453, 0.018564948812127113, -0.003495229175314307, -0.01...
a60e625bffa2f7ea4ad1369ede776929b5609811
subsection
89
95
The case of derivators
The preprint ends with a short statement of purpose drawing a connection with the present work. As the main purpose of was to lay down the theory of co/reflective localizations of derivators, it has been natural to surmise that there exists a notion of locally presentable and accessible derivator allowing to restate th...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 96, "openalex_id": "https://openalex.org/W2789059295", "raw": "F. Loregian, Localization theory for derivators, arXiv preprint arXiv:1802.08193 (2018).", "source_ref_id": "d8488eb78503ca0c0360777629983ec54759b555", "st...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.04443958029150963, -0.016069669276475906, -0.004658373072743416, 0.044164884835481644, 0.005772414617240429, -0.05426756292581558, -0.006844488903880119, 0.04831583425402641, 0.020907357335090637, 0.03189516440033913, -0.0047117858193814754, 0.03543568029999733, -0.04907887801527977, -0...
a3ba3cffe4979e872dc024fd52ad4a827ea429d7
subsection
90
95
The case of derivators
In fact, Street's one is presumably only one among a complicated web of Yoneda structures: notably, we can record/conjecture the existence ofThe Muro-Raptis Yoneda structure, built taking the represented derivator on \text{\fontseries {b}\selectfont {\upshape sSet}}; this is again representable, and the canonical map \...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1007/s10485-007-9079-2", "end": 560, "openalex_id": "https://openalex.org/W2093735953", "raw": "M. Weber, Yoneda structures from 2-toposes, Appl. Categ. Structures 15 (2007), no. 3, 259–323.", "source_ref_id": "e687e2d5b0a10c5942e8...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
[ -0.040710464119911194, 0.014640813693404198, -0.037872329354286194, 0.045043960213661194, 0.023147590458393097, -0.05892946571111679, -0.0018129355739802122, 0.041168227791786194, 0.010414127260446548, 0.029937755316495895, -0.030029308050870895, 0.013763432390987873, -0.035339366644620895, ...
c2494bfebaa6f5f629fb5e70809866c67672f59a
subsection
91
95
The case of derivators
This evidently echoes our REF .The preprint ends with a short statement of purpose drawing a connection with the present work. As the main purpose of was to lay down the theory of co/reflective localizations of derivators, it has been natural to surmise that there exists a notion of locally presentable and accessible d...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 127, "openalex_id": "https://openalex.org/W2789059295", "raw": "F. Loregian, Localization theory for derivators, arXiv preprint arXiv:1802.08193 (2018).", "source_ref_id": "d8488eb78503ca0c0360777629983ec54759b555", "s...
1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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929643866455e0439380f62862f10783ad660090
subsection
92
95
The case of derivators
In fact, Street's one is presumably only one among a complicated web of Yoneda structures: notably, we can record/conjecture the existence ofThe Muro-Raptis Yoneda structure, built taking the represented derivator on \text{\fontseries {b}\selectfont {\upshape sSet}}; this is again representable, and the canonical map \...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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ad00206a20bfafaeb08e775e27412fa9fedbcddd
subsection
93
95
The case of derivators
This evidently echoes our REF .The preprint ends with a short statement of purpose drawing a connection with the present work. As the main purpose of was to lay down the theory of co/reflective localizations of derivators, it has been natural to surmise that there exists a notion of locally presentable and accessible d...
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1804.08710
Accessibility and presentability in 2-categories
[ "Ivan Di Liberti", "Fosco Loregian" ]
[ "math.CT" ]
2,018
en
Mathematics
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