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9cb144c4a2d798ad8e34f1b81ead25f5d2de03fc
subsection
136
223
Below [PR:BDN]BD-N
Since *{u_k} \geqslant L we must have k \geqslant K and therefore f(\alpha _k) = f(\beta _k). But this is a contradiction, sincef(\alpha _k) = f(\overline{\alpha }L \ast w \ast 000\ldots ) \ne f(\overline{\alpha }L \ast w \ast 1 \ast 000\ldots ) = f(\beta _k) \ .Altogether L is a modulus of constancy and therefore for ...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.042203404009342194, -0.003269009292125702, -0.04504137858748436, -0.021773051470518112, -0.0035589097533375025, 0.02387864515185356, 0.03365897014737129, 0.008902995847165585, 0.018843531608581543, 0.036771588027477264, -0.04366816580295563, 0.02418380230665207, 0.002874210709705949, 0....
5ce186f00dd69a80f35df88d815f7cd9c74c371a
subsection
137
223
Introduction
Let us assume that K \subset 2^{\ast } is a decidable tree (i.e. it is closed under restriction) that does not admit infinite paths; that is\forall {\alpha \in 2^{\mathbb {N}}} : {\exists {n \in \mathbb {N}} : {\overline{\alpha }n \notin K}} \ .Then the complement B \subset 2^{\ast } has the following properties:B is d...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ 0.0048101553693413734, 0.033751193434000015, -0.05297655612230301, 0.015899071469902992, -0.02680870145559311, -0.025954240933060646, 0.025145554915070534, 0.03127936273813248, 0.0018538744188845158, 0.05376998707652092, -0.0325915701687336, -0.005004697944968939, 0.021926069632172585, 0.0...
e0144ec7588100dbf17fc340118ec68bbd7ec999
subsection
138
223
Introduction
Therefore there are actually only two Anti-Fan principles to consider: Anti-[PR:FAN]FAN_{\Delta } and Anti-[PR:FAN]FAN_{c}.In a similar spirit we can also define Anti-WWKL for k \in (0,1): [leftmargin=2em,rightmargin=3em,skipabove=1em,skipbelow=1em, innerleftmargin=-1em,innerrightmargin=0em, nobreak=true, linecolor=blu...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.04782332107424736, 0.024110034108161926, -0.04678567498922348, -0.004719005431979895, -0.0023251688107848167, -0.021164948120713234, 0.06241142004728317, 0.011078408919274807, -0.010872405022382736, 0.05734525993466377, -0.026597335934638977, 0.0013609580928459764, -0.011108927428722382, ...
ce309292759d04835ddaa2c7e0b7de2863f9a669
subsection
139
223
Singular Covers
By slightly extending, in an obvious way, the observation at the start of Section we can see that Anti-[PR:WWKL]WWKL (k) is equivalent to [leftmargin=2em,rightmargin=3em,skipabove=1em,skipbelow=1em, innerleftmargin=-1em,innerrightmargin=0em, nobreak=true, linecolor=blueish, linewidth=5pt, bottomline=false, topline=fals...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.07181631773710251, 0.0053770714439451694, -0.024772662669420242, -0.006002489477396011, 0.019601522013545036, 0.023704875260591507, 0.01844220981001854, 0.009282121434807777, -0.014422754757106304, 0.07633153349161148, -0.008229588158428669, 0.0036628914531320333, -0.011371933855116367, ...
8b24b8a915e869a59e86f8d479a50b3eb63defb6
subsection
140
223
Singular Covers
Since T blocks \alpha there is n_{1} \in \mathbb {N} such that \alpha [ \colon \!n_{1}] \in B. Since also \alpha [n_{1}+1 \colon \!] gets blocked there exists n_{2} such that \alpha [n_{1}+1 \colon \!n_{2}] \in B, which means that \alpha [ \colon \!n_{2}] \notin S.Last, we need to count the nodes at a level n in S. The...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ 0.024605413898825645, 0.031474173069000244, -0.03281739726662636, 0.0035431338474154472, 0.008448570966720581, 0.016500281170010567, -0.022880593314766884, -0.007181667257100344, -0.021277884021401405, 0.047806549817323685, -0.0012401922140270472, -0.02146105095744133, -0.017812976613640785,...
b1e5ac502396260c0f67feea2a1b3662ef2e24d4
subsection
141
223
Singular Covers
If we collect all of the finite sequences w_n that are just barely not in T, i.e. w_n \notin T but \overline{w_n}(*{w_n} -1) \in T, then these give us basic open sets U_n = U_{w_n} where U_{w} = \mbox{$\left\lbrace \,\alpha \in 2^{\mathbb {N}} \, | \,\overline{\alpha }*{w} = w \,\right\rbrace $}. These form a cover of ...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.024546239525079727, 0.05787969380617142, -0.027643123641610146, -0.013096921145915985, 0.015743765980005264, -0.0032780440524220467, -0.02167818881571293, 0.02584296278655529, -0.009405069053173065, 0.024302149191498756, -0.018962694332003593, 0.010419565252959728, -0.0035774349234998226,...
69596f34761ac0b5dabcbe12be469a45edbfe008
subsection
142
223
Singular Covers
Using dependent choice we can construct a sequence \alpha \in 2^{\mathbb {N}} such that x \in I_{\overline{\alpha }n} for all n \in \mathbb {N}. Now, since T does not admit infinite paths, there exists m such that w_m = \overline{\alpha }M where M = *{w_m}. This means thatx \in I_{w_m} \subset \bigcup _{n \in \mathbb {...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ 0.008467636071145535, 0.03387054428458214, -0.010588359087705612, 0.019345877692103386, -0.011496150866150856, 0.04570997506380081, 0.007407274097204208, -0.00807858258485794, 0.005851060152053833, 0.024106061086058617, -0.014318695291876793, 0.009062658995389938, -0.012922680005431175, 0....
39ed2e740f0227a1cb479f629b62dcdc10a0fbe6
subsection
143
223
Singular Covers
Now choose rationals a^\prime _n and and b_n^\prime such that a_n^\prime \leqslant a_n, b_n \leqslant b_n^\prime , *{a_n^\prime - a_n} < \frac{\alpha }{2^{n+2}}, and *{b_n^\prime - b_n} < \frac{\alpha }{2^{n+2}}. Then I^\prime _n = (a_n^\prime , b_n^\prime ) are obviously still a cover of [0,1] and for any n \in \mathb...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.029760058969259262, 0.035205647349357605, -0.01182928029447794, -0.028555013239383698, -0.013019072823226452, -0.01461308915168047, 0.007264596875756979, -0.003064096439629793, 0.006780290510505438, 0.024131426587700844, -0.015375776216387749, -0.009770024567842484, -0.018487541005015373,...
18e7f9428c8ab4be9b0af5017662c85d9c0816b8
subsection
144
223
Singular Covers
Hence T does not admit infinite paths.So the only item left to consider is to show that T satisfies Equation (REF ). First notice that by definition of T for n \in \mathbb {N}\sum _{{u \notin T \\ *{u} = n}} *{I_u} \leqslant \sum _{i=1}^n *{J_i} \ .So\sum _{{u \in T \\ *{u} = n}} \frac{1}{2^{{u}}} = 1 - \sum _{{u \noti...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.03442435711622238, 0.03723201900720596, -0.017807280644774437, -0.003017471870407462, -0.012100405991077423, 0.04223697632551193, -0.012100405991077423, 0.0061532012186944485, -0.05090410262346268, 0.032410167157649994, -0.0028973070438951254, -0.004425116814672947, 0.009506371803581715, ...
e9c85414dae855eec8be311c1fdbc45d21fa1b88
subsection
145
223
Kleene Trees
As already mentioned in the introduction of Chapter , in some schools of constructive mathematics there exists a Kleene tree. In this section we want to investigate equivalences of the existence of such an object. [leftmargin=2em,rightmargin=3em,skipabove=1em,skipbelow=1em, innerleftmargin=-1em,innerrightmargin=0em, no...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.029619747772812843, 0.01825101487338543, -0.042483966797590256, 0.010704921558499336, 0.007725398056209087, -0.022432265803217888, -0.0037959362380206585, 0.02383618988096714, -0.002002880908548832, 0.05200623348355293, -0.018632514402270317, -0.0015250507276505232, -0.040469639003276825,...
c3189b20920573e4e6cd670cb9145e507449b3ba
subsection
146
223
Kleene Trees
Assume that [PR:KT]KT holds, so assume that T is a decidable infinite tree that blocks ever infinite path. In particular we can find \left\lbrace u_{1}, u_{2}, \dots \right\rbrace an injective enumeration of all u \notin T such that \overline{u}({u}-1) \in T. In particular, for every \alpha \in 2^{\mathbb {N}} there ex...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.002582963788881898, 0.04178525507450104, -0.016085339710116386, 0.025593088939785957, -0.011392510496079922, -0.05805373191833496, 0.005116328597068787, 0.017367282882332802, 0.020923150703310966, 0.06605061888694763, 0.005043837707489729, -0.0028939114417880774, -0.010690493509173393, ...
a7a3bce2180d1da6d81cd92d789af6fbd8f1d49c
subsection
147
223
Kleene Trees
Now defineT = \mbox{$\left\lbrace \,u \in 2^{\ast } \, | \,\forall {i \leqslant {u}} : { \mu (\overline{u}i \ast 000\ldots ,1) > *{i}} \,\right\rbrace $} \ .By definition T is decidable and closed under restriction. We claim that it does not admit infinite paths, but is infinite. To see that T does not admit infinite p...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ 0.013017459772527218, 0.027713606134057045, -0.016786877065896988, 0.04349327087402344, 0.003914394415915012, -0.014398561790585518, -0.04031902551651001, 0.006321785040199757, 0.025806007906794548, 0.04730847105383873, -0.011193794198334217, 0.0036301619838923216, 0.003391711972653866, 0....
9e98fe502f0b29618eb22692dcdfe54317b9c05c
subsection
148
223
Specker Sequences
In the seminal article E. Specker showed that in recursive mathematics there exists an increasing, computable sequence of rationals (r_n)_{n \geqslant 1} in [0,1] that does not converge to a computable number. More than that, he showed that it does not converge to a computable number in the strong sense that it is comp...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.0324433296918869, 0.01950262300670147, -0.0325348898768425, -0.005005368031561375, -0.01361215952783823, 0.009018818847835064, -0.0005875203059986234, -0.0031626904383301735, 0.02846040017902851, 0.03717401251196861, -0.028658783063292503, 0.01776295155286789, -0.013947884552180767, -0....
ca996bc312d534553829b22a11c58463b8f45655
subsection
149
223
Specker Sequences
In the second case by Lemma REF .2 we have that d(x,F(2^{\mathbb {N}})) > \delta for some \delta > 0. In both cases *{x_n - x} > \min \left\lbrace \delta , 3^{-(N+2)} \right\rbrace for all n \geqslant N.In the following we want to weaken the requirement of decidability on a Kleene tree. Just as a decidable tree is the ...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.027378544211387634, 0.013193284161388874, -0.04215136170387268, 0.002844301052391529, 0.006382985506206751, -0.027637984603643417, 0.024280525743961334, 0.021350381895899773, -0.0012867077020928264, 0.04941567778587341, 0.003090387675911188, -0.017641916871070862, -0.004963696468621492, ...
3326ae1196fcd37518de7ef1c19215d04ef79bee
subsection
150
223
Specker Sequences
We want to show thatu \in T \iff \exists {w \in 2^{\ast }} : {uw \in \left\lbrace w_{1},w_{2},\dots \right\rbrace }is a c-Kleene tree. It is clear that it is a c-tree by definition, and that it is infinite, since w_n \in T and *{w_n} \geqslant n for all n \in \mathbb {N}. So it remains to show that T does not admit any...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.03766674920916557, 0.04334423318505287, -0.02241995744407177, 0.01767345890402794, -0.0044946749694645405, -0.012781970202922821, -0.0042123268358409405, 0.016238825395703316, 0.015040754340589046, 0.050303731113672256, 0.009149601683020592, 0.008134675212204456, 0.007371571846306324, 0...
476ce718d261a4099ceb7f9c8587fe818298740e
subsection
151
223
Specker Sequences
Now for \beta \in 2^{\mathbb {N}} defined by\beta (i) = \alpha _{\pi _{1}(i)}(\pi _{2}(i))we have that \beta \circ ( \pi ^{-1}(m,\cdot )) = \alpha _{m} and therefore \Phi (\beta )(m) = \varphi (\alpha _{m}) = \gamma (m). Thus \Phi (\beta ) = \gamma , which means \Phi is surjective. It is also straightforward to show th...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.07398299127817154, 0.010339000262320042, -0.023043381050229073, -0.002945279935374856, 0.010865488089621067, -0.045232173055410385, -0.02200566604733467, 0.02287551574409008, 0.0342446006834507, 0.04361455887556076, -0.022494003176689148, 0.027514712885022163, -0.019640285521745682, 0.0...
ce0bfcf46d0cbd6c9cc737ba4e7381dc4c521e9a
subsection
152
223
Basic Relations
It has long been known that [PR:WKL]WKL implies [PR:FAN]FAN_{\Delta } . In Berger has shown that it also implies [PR:FAN]FAN_{c}. This result in turn was again slightly improved upon in where we showed that it also implies [PR:UCT]UCT. For completeness' sake we will include the proof here.Lemma 1.1 [PR:LLPO]LLPO/ [PR:W...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.06089028716087341, 0.016542624682188034, -0.0515507236123085, 0.002214712556451559, -0.0026038610376417637, 0.010033925995230675, 0.007580764591693878, -0.022509567439556122, 0.0027507455088198185, 0.03665625676512718, 0.0009442573064006865, -0.022875824943184853, 0.00811870489269495, 0...
31b77a2841691f3e036f0d7fbc14a19b3a57f128
subsection
153
223
Basic Relations
Now define a decidable set T byT = \mbox{$\left\lbrace \,u \in 2^{\ast } \, | \,\Lambda (u) \,\right\rbrace $} \cup \mbox{$\left\lbrace \,u \in 2^{\ast } \, | \,\exists {v} : {(F(v) \wedge u = v\ast 0 \ast \dots \ast 0)} \,\right\rbrace $} \ .Notice that for every n \in \mathbb {N} either \mu (u) = 0 for all u \in 2^{*...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ 0.009890529327094555, -0.0035677640698850155, -0.044843170791864395, 0.05055159330368042, 0.043500013649463654, -0.02315421774983406, -0.016362110152840614, 0.0045598698779940605, 0.0154310567304492, 0.03904316946864128, -0.004269869532436132, 0.006112896371632814, -0.0160721093416214, -0....
0922dd5b60c9675b1c2c5296731faf43ed477955
subsection
154
223
Basic Relations
But this leads to the contradictionb \leqslant f(v \ast 000\ldots ) = f (\alpha ) < b \ .By sequential continuity, the fact that f(u \ast 000\ldots ) \leqslant b for all u \in 2^{*} now implies f(\alpha ) \leqslant b for all \alpha \in 2^{\mathbb {N}}.Lemma 1.2 [PR:FAN]FAN_{c} implies that an order located image of a p...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.030137168243527412, 0.008194257505238056, -0.0242012906819582, 0.012978056445717812, 0.00484102126210928, -0.009537078440189362, -0.02465907111763954, 0.008751222863793373, 0.02343832515180111, 0.029954057186841965, -0.029389461502432823, 0.010872269980609417, -0.02208024449646473, 0.01...
5166b481301fb62241343eb0a6d07a3f36116c16
subsection
155
223
Basic Relations
Moreover, this last statement was shown to be an equivalent of [PR:UCT]UCT in .This result enables us to replace “uniformly continuous” by “point-wise continuous” thereby improving the well known characterisation of [PR:WKL]{\textrm {WKL}} .Corollary 1.4 [PR:WKL]WKL is equivalent to the statement that every point-wise ...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.025264199823141098, 0.02303680032491684, -0.009245232678949833, -0.021755283698439598, -0.022502833977341652, -0.06291639804840088, 0.02794928289949894, -0.016888568177819252, -0.0010812802938744426, 0.030115658417344093, 0.014439954422414303, -0.006232141051441431, 0.00884857214987278, ...
2de02f64bcde1802c309eeaf2e6be1cbcc01440f
subsection
156
223
Kripke's Schema and the Principle of Finite Possibility
Kripke's Schema, which goes back to Kreisel (see historical notes *Ch apter 4, 10.6) and Myhill jM68, jM66, states that [leftmargin=2em,rightmargin=3em,skipabove=1em,skipbelow=1em, innerleftmargin=-1em,innerrightmargin=0em, nobreak=true, linecolor=blueish, linewidth=5pt, bottomline=false, topline=false, rightline=false...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.04013298079371452, -0.003982778638601303, -0.004654204938560724, -0.024873292073607445, -0.008560685440897942, -0.012779989279806614, 0.062167972326278687, 0.007667993661016226, 0.04019401967525482, 0.04236089438199997, -0.0737958550453186, 0.0002577456762082875, -0.007751921657472849, ...
b6d9b9ef7628c08876792f3fd01cd1cabf7c3cee
subsection
157
223
Kripke's Schema and the Principle of Finite Possibility
The “rejection” of [PR:MP]MP using [PR:WPFP]WPFP is of course only convincing if one agrees with the latter and disagrees with [PR:LPO]LPO.Proposition 2.1 [PR:WPFP]{\textrm {WPFP}} + [PR:MP]{\textrm {MP}} \iff [PR:LPO]{\textrm {LPO}}Note that a proof of this fact has already been sketched in *page 258. It will, howeve...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.016083892434835434, 0.023545963689684868, -0.016694286838173866, -0.00949163269251585, -0.026094360277056694, -0.060947880148887634, 0.030962254852056503, -0.038851603865623474, 0.008339513093233109, 0.02209627628326416, -0.01276487298309803, -0.0064396606758236885, 0.0014525478472933173,...
e44d5e6db61604c6328f85afc41320eced64473e
subsection
158
223
Kripke's Schema and the Principle of Finite Possibility
We remind the reader that [PR:LLPO]LLPO is strictly stronger than [PR:MPv]{\textrm {MP}^{\vee }}.Proposition 2.3 [PR:WPFP]{\textrm {WPFP}} + [PR:MPv]{\textrm {MP}^{\vee }} \iff [PR:WLPO]{\textrm {WLPO}} .This has also been proven in and was also pointed out in *Proposition 25.Let (a_n)_{n \geqslant 1} be a binary seque...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.015165701508522034, 0.03158249706029892, -0.016172679141163826, -0.016615139320492744, 0.008704258129000664, -0.02680697850883007, 0.02370975911617279, 0.02032265067100525, 0.008002424612641335, 0.014936842955648899, -0.03371851146221161, 0.0003528237866703421, 0.013792549259960651, 0.0...
4a1b8a6f85180c294d5129c7ea8aaa039de75021
subsection
159
223
Kripke's Schema and the Principle of Finite Possibility
Every open subset of a separable metric space is a countable union of open balls.There are also some equivalences of [PR:KS]KS involving the countability of subsets of \mathbb {N} in .Finally, even though it might seem like [PR:PFP]PFP and [PR:WPFP]WPFP are rather “ad hoc” principles among many others, the following re...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.01608445681631565, -0.008934961631894112, -0.06287282705307007, 0.006920589134097099, -0.008629753254354, -0.02072361670434475, 0.025118611752986908, -0.00956826750189066, 0.0060316710732877254, 0.0230431966483593, -0.05905773118138313, -0.005062635987997055, 0.0005240992177277803, 0.02...
42103cdd7c779e05902ec873b84d41f33b16e1f3
subsection
160
223
Kripke's Schema and the Principle of Finite Possibility
The rest is pretty much the well known argument from recursion theory that shows that if a set A \subset \mathbb {N} and its complement \overline{A} are recursively enumerable, then it is decidable. So let (a_n)_{n \geqslant 1} be arbitrary. By co-[PR:PFP]PFP there exists (b_n)_{n \geqslant 1}, such that \exists {n \i...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.019992180168628693, 0.00008584428724134341, -0.011796913109719753, 0.02263236977159977, -0.02046527899801731, -0.032170623540878296, 0.009378011338412762, 0.019641174003481865, 0.0028519381303340197, 0.041663095355033875, -0.048866383731365204, 0.009522993117570877, -0.030781853944063187,...
d1e606ef2037e7458e4a087c97b54e83f7801815
subsection
161
223
Collapsing the Fan Theorems
As we have seen in Proposition REF under the assumption of [PR:BDN]BD-N we have [PR:FAN]{\textrm {FAN}_{c}} \Rightarrow [PR:FAN]{\textrm {FAN}_{\smash{\Pi ^{0}_{1}}}} . This result was first proved in . It is still interesting to give a direct proof, in order to understand the subtle difference between [PR:FAN]FAN_{c} ...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.041401948779821396, 0.0404561422765255, -0.04070022329688072, 0.001082148402929306, 0.0014072696212679148, -0.02803860791027546, 0.035238947719335556, 0.004946419503539801, 0.023568905889987946, 0.05330081656575203, -0.04317152500152588, 0.002011747332289815, 0.005076086614280939, 0.030...
5d6e5b12dec718fac21c7f54e68c580605f9edfd
subsection
162
223
Collapsing the Fan Theorems
Now we can use [PR:BDN]BD-N to conclude that A is bounded, which immediately translates into B being uniform.Remark 3.2 Notice that the previous proof relies on the assumption that B is closed under extension and therefore does not work for [PR:FANst]FAN_{\textrm {stable}}.Since [PR:BDN]BD-N is a very weak principle al...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.04994860664010048, 0.021709488704800606, -0.05135216936469078, 0.004580656532198191, -0.01575959287583828, -0.010213986039161682, -0.006407579407095909, -0.004195438697934151, 0.015294281765818596, 0.05132165923714638, -0.023647017776966095, -0.015866387635469437, -0.0033086754847317934, ...
70c2d324638f997aaa4c96d4ec6a1f576751e373
subsection
163
223
Collapsing the Fan Theorems
What is the relationship to [PR:WCN]WCN[leftmargin=2em,rightmargin=3em,skipabove=1em,skipbelow=1em, innerleftmargin=-1em,innerrightmargin=0em, nobreak=true, linecolor=blueish, linewidth=5pt, bottomline=false, topline=false, rightline=false, backgroundcolor=blueish!10]([PR:CC]CC)     Continuous choice.CC(1) Any function...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.038853470236063004, 0.022387290373444557, -0.03561822697520256, -0.015085096471011639, -0.02028132975101471, 0.002559964545071125, 0.0038780984468758106, 0.0389450341463089, 0.003530919784680009, 0.05429719388484955, -0.023638660088181496, 0.014993533492088318, 0.004437017720192671, 0.0...
24677ca880aafc89498867c88166dca09e0fecfa
subsection
164
223
Collapsing the Fan Theorems
It is easy to see that this bound K is also a uniform bound for B.Proposition 3.5 Under the assumption of [PR:KS]KS we have [PR:FAN]{\textrm {FAN}_{\Delta }} \Rightarrow [PR:FAN]{\textrm {FAN}_{\textrm {full}}} .If B is an arbitrary bar, then, using [PR:KS]KS, there exists, for every u \in 2^{\ast } a sequence (a^u_n)_...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.016999434679746628, 0.018433857709169388, -0.058506134897470474, -0.003200746374204755, -0.012673277407884598, -0.01800658367574215, -0.005833064671605825, -0.0039942567236721516, 0.012482529506087303, 0.04880089312791824, -0.04068266972899437, 0.02049393206834793, 0.013192110694944859, ...
d077d21e68ff3681b83d06063fb9b5b038ba97a6
subsection
165
223
Other Implications
Proposition 4.1 [PR:WMP]WMP implies that [PR:LPO]LPO and [PR:WLPO]WLPO are equivalent.Consider x \in \mathbb {R}, such that x \geqslant 0. By [PR:WLPO]WLPO we know that either x=0 or \lnot (x=0); or with the notation introduced in Chapter whether x=0 or 0 \lessdot x. In the second case we can, using [PR:WLPO]WLPO again...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.06657099723815918, 0.03722118213772774, -0.01949535682797432, 0.02388867735862732, -0.004267469514161348, -0.009267158806324005, 0.03172953426837921, 0.011288391426205635, -0.005903523415327072, -0.0024350127205252647, -0.04152297601103783, -0.02608533762395382, -0.002253864658996463, 0...
aa0bd2cc87fbc264c4c82dac36525016ae11574a
subsection
166
223
Other Implications
In the second case \lnot (\forall {n \in \mathbb {N}} : {a_n=0}) and hence [PR:WLPO]WLPO holds.Proposition 4.4 [PR:CC]CC (1) implies [PR:BDN]BD-N.A simple consequence of Proposition REF .
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.015460064634680748, 0.04987511411309242, -0.011141013354063034, -0.01735251024365425, -0.017596697434782982, -0.003658983623608947, 0.0071081193163990974, 0.023319819942116737, 0.012384839355945587, 0.0038898163475096226, 0.000841776083689183, 0.006108480505645275, -0.00437246635556221, ...
57f6ca2161fc12ce93e83bfcf3030320a279b033
subsection
167
223
The Big Picture
As a handy overview of the relationship between most of the principles discussed we include the following diagram. Dotted lines indicate contradictions. [Figure: NO_CAPTION]
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.01838815212249756, -0.009926550090312958, -0.022645657882094383, -0.04391792416572571, -0.04034711420536041, -0.05127318575978279, 0.029390523210167885, 0.027071021497249603, 0.02517879754304886, 0.035860709846019745, 0.002966138534247875, -0.03137430548667908, 0.006363368593156338, 0.0...
2324a7ffb6424f4c8cee82b79c521849382f8177
subsection
168
223
The Big Three
The easiest and most convenient way to see that principle A does not imply principle B, or more general, that theorem T is not provable in BISH is to show that theorem T is false in classical mathematics (CLASS), Brouwer's intuitionism (INT), or in Markov's recursive school of mathematics (RUSS). The view that all thre...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.0342412032186985, -0.019790926948189735, -0.021683042868971825, 0.00482947425916791, 0.00475699407979846, -0.018570207059383392, 0.002933543175458908, -0.0042610764503479, 0.02612341195344925, 0.03863579407334328, -0.04086361080408096, -0.00729380315169692, 0.030090752989053726, 0.02705...
47c13bbc52cd0af2a0ca83d30098a79cc77472f9
subsection
169
223
Topological and Heyting-valued Models
Topological models are a natural setting to interpret formalised intuitionistic theories. By “intuitionistic” we mean theories using intuitionistic logic; it is worth noting though, that topological models also have a distinct intuitionistic flavour a'la Brouwer. For example they all validate [PR:FAN]FAN_{\textrm {full...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.031274572014808655, -0.0071969651617109776, 0.02192271128296852, 0.03341039642691612, 0.0040389965288341045, -0.05910130962729454, 0.0027613157872110605, -0.0036862040869891644, 0.03582082688808441, 0.017788365483283997, -0.03142713010311127, 0.019817398861050606, 0.0005878284573554993, ...
f2667dfe9364dc5e427bfc76e4e8ea43eb81c586
subsection
170
223
Propositional Logic
The basic idea of topological models is to use open sets the truth values. As usual, the propositional case is a lot easier and cleaner to deal with than the predicate case.A topological model for propositional intuitionistic logic consists of a topological space (T,\tau ), and a function \llbracket \cdot \rrbracket th...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.012907524593174458, 0.00033875578083097935, 0.01483754999935627, 0.022016026079654694, 0.01042824238538742, -0.06749750673770905, 0.021649854257702827, 0.028485044836997986, 0.02302299626171589, 0.016965918242931366, -0.043971024453639984, 0.026043906807899475, -0.004226222634315491, 0....
7e61b0cd0c7fed0787d19dcfcd4fb00c944ba9e2
subsection
171
223
Propositional Logic
Then \llbracket \lnot P \rrbracket = (0,\infty ) and therefore \llbracket \lnot \lnot P \rrbracket = (-\infty ,0). However \mathbb {R}\ne \llbracket \lnot P \vee \lnot \lnot P \rrbracket = (-\infty ,0) \cup (0,\infty ).This space T is actually not the simplest model showing that [PR:WLEM]WLEM is not derivable in intuit...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.03606812655925751, 0.02705109491944313, 0.015142815187573433, 0.004806031938642263, -0.011412419378757477, -0.05217977613210678, 0.023618215695023537, 0.01257959846407175, 0.0059732114896178246, 0.01840023696422577, -0.01576073467731476, 0.015913305804133415, 0.011305618099868298, -0.01...
0c6b1ff97bf112a5b15ef6f32771c1a0af07774a
subsection
172
223
Predicate Logic
To extend the topological interpretation to predicate logic we also need some universe \mathcal {U} to interpret constants and variables. A predicate \llbracket P(x_1, \dots , x_k) \rrbracket should be mapped to a function \mathcal {U}^k \rightarrow \tau . It is convenient for d \in \mathcal {U} and a formula \varphi (...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.024778958410024643, 0.03240795060992241, -0.030439669266343117, 0.011985142715275288, -0.020384659990668297, -0.009414173662662506, 0.02596908062696457, 0.0022581808734685183, 0.034940771758556366, 0.01525035034865141, -0.022475004196166992, -0.026121661067008972, -0.0004996988573111594, ...
c7ea783a5ce09d193f80bbc43cd7ef46ed5cb96b
subsection
173
223
Predicate Logic
Since it will not affect the following, we will not distinguish between having a logic with different types or having some sort of set theory.Again one can easily show soundness, by induction over deductions. Notice that in general we do not have an existence property, that is we do not have that if T \Vdash \exists {x...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.0024681712966412306, 0.0015287784626707435, -0.017883751541376114, 0.036042168736457825, -0.03341758996248245, -0.041657544672489166, -0.00407801428809762, 0.015579616650938988, 0.02499452605843544, -0.01628153771162033, -0.013893477618694305, -0.016693536192178726, 0.008941875770688057, ...
9149825c7a61382c6b897fdbb19463d677ef5cb5
subsection
174
223
Topological Models of Arithmetic and of Analysis
Naturally, we want to consider models that validate, at least, Heyting arithmetic. To be precise, we assume that our language contains a constant 0 and function symbols s, +, \cdot and that a model validates the axioms 2\forall {x} : {\lnot (x = s(0))} \forall {x,y} : {s(x)=s(y) \rightarrow x=y} \forall {x} : {x+0 = ...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.008590334095060825, 0.017562121152877808, -0.025374289602041245, 0.05953726917505264, -0.000398142117774114, -0.07037054747343063, -0.001936830347403884, 0.0032328187953680754, 0.019591454416513443, 0.02911253459751606, -0.036802638322114944, 0.02110200934112072, -0.008735286071896553, ...
c5f8760d0da1cd47bf774157ddff2c4e01fb2202
subsection
175
223
Topological Models of Arithmetic and of Analysis
In other words, we can export natural numbers locally.It is enough to use natural induction (H7) to show thatT \Vdash x \in \mathbb {N}\rightarrow N(x) \ .The case x = 0 is obviously fine. So let x be an arbitrary variable symbol of the natural number type, and let t \in T be arbitrary.By the induction hypothesis there...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.03616711124777794, 0.018816053867340088, -0.015130671672523022, 0.05051187425851822, 0.005867617670446634, -0.03213836997747421, -0.02365359663963318, 0.01206333376467228, 0.021593444049358368, 0.02247854694724083, -0.0532892644405365, 0.03821200132369995, 0.016801683232188225, 0.007473...
7355e3749973fbf1daf8db8a57d2b83f29554995
subsection
176
223
Topological Models of Arithmetic and of Analysis
Therefore also, in particular,\llbracket x>0 \rrbracket & = \mbox{$\left\lbrace \,t \, | \,f(t) > 0 \,\right\rbrace $} \ , \\ \llbracket x=0 \rrbracket & = \mathrm {Int}\left(\mbox{$\left\lbrace \,t \, | \,f(t) = 0 \,\right\rbrace $}\right) \ , \\ \llbracket x \geqslant 0 \rrbracket & = \mathrm {Int}\left(\mbox{$\left\...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.055258605629205704, 0.054678864777088165, -0.02116059884428978, 0.004954508971422911, -0.0055418796837329865, 0.017849963158369064, 0.013623946346342564, -0.008040111511945724, 0.030772117897868156, 0.044548626989126205, -0.016919324174523354, -0.031061988323926926, 0.00019678345415741205...
8b74bb373c59fc42af2d1923df071477fdafe97a
subsection
177
223
Topological Models of Arithmetic and of Analysis
It suffices to show that, given \varepsilon > 0, we can find an open neighbourhood U of t_0 such that\forall {t,t^\prime \in U, q \in f(t)} : {\exists {p\in f(t^\prime ) } : { *{q-p} < \varepsilon }} \ .So let \varepsilon >0 and t_0 \in T be arbitrary. We may, without loss of generality, assume that \varepsilon \in \ma...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.02943682298064232, 0.029574165120720863, -0.029314743354916573, 0.01745760813355446, 0.016419917345046997, 0.029879368841648102, 0.03586134687066078, -0.013322108425199986, 0.020402817055583, 0.0190904438495636, -0.014375058934092522, 0.02090640179812908, -0.00003260664379922673, 0.0022...
2cb51f4ac1c9e9c0a6649144d75c2ce1e215cd95
subsection
178
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Topological Models of Arithmetic and of Analysis
ThusU \subset \llbracket \lnot ( \breve{q} < x) \rrbracket \subset {\llbracket \breve{q} < x \rrbracket }^\prime \subset \llbracket x < \breve{s} \rrbracket ;because we have assumed that T is a model for the constructive reals and thereforeT = \llbracket \breve{q}< x \ \vee \ x < \breve{s} \rrbracket = \llbracket \brev...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.04930849373340607, 0.02233528345823288, -0.016431080177426338, 0.025691678747534752, -0.009352137334644794, -0.021847080439329147, 0.02024516463279724, 0.03545573726296425, -0.007647241000086069, 0.008718999102711678, 0.014058718457818031, 0.00048581912415102124, 0.0226556658744812, 0.0...
eeb2e89ec92b0c6a5a07e5ebeff0bc3cafa13dd3
subsection
179
223
The Full Model and Countable Choice
The commonly used models are the “full” ones, whose existence is guaranteed by the following.Proposition 2.6 For any topological space (T,\tau ) there exists a model such thatIt is a model of IZF (therefore also of CZF, HA, and the real numbers). For every V \in \tau there is a proposition P_V such that \llbracket P_V...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.017666880041360855, -0.001393097685649991, -0.0336860716342926, 0.023983020335435867, 0.01331881433725357, -0.03170274570584297, 0.04448758438229561, 0.014394388534128666, 0.014951246790587902, 0.015820859000086784, -0.04817963019013405, 0.01772790588438511, -0.0046989633701741695, 0.01...
ce7f04de0fa529f5e13b0814695eb13ce4de4650
subsection
180
223
The Full Model and Countable Choice
Thus [PR:LPO]{\textrm {LPO}} _\sigma holds, since we are working with a classical metatheory.Together we have\mathbb {R}\Vdash [PR:LPO]{\textrm {LPO}} _\sigma \text{ but } \mathbb {R}\nVdash [PR:LPO]{\textrm {LPO}} _\mathbb {R}\ ,and therefore\mathbb {R}\nVdash [Sec:Choice]{\textrm {ACC}}\ .For the rest of the section ...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.04913649708032608, 0.017350371927022934, 0.01719777286052704, 0.022141942754387856, -0.022569216787815094, -0.05926899239420891, 0.02005135267972946, 0.03189294412732124, 0.022447139024734497, 0.009766260161995888, 0.01324549037963152, 0.005501151084899902, -0.0023557287640869617, 0.022...
d5bb459c608bb54ce0ae0fda608fc27bce70d2b1
subsection
181
223
Reverse Reverse Mathematics
In the following we give some characterisation of properties of topological spaces, such that the full model satisfies certain principles. This is actually quite a natural question to consider, and these kind of results are very helpful to find custom separations of principles. We have—not entirely seriously—named this...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.014230147935450077, -0.001960937399417162, -0.0036090402863919735, 0.014787145890295506, 0.007717852480709553, -0.055730294436216354, 0.027727806940674782, -0.02910122461616993, 0.02727000042796135, 0.022508813068270683, -0.008019241504371166, 0.03430495783686638, 0.020357122644782066, ...
8f651a30d7114af958414f4c230b09cd5fad9188
subsection
182
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Reverse Reverse Mathematics
But also in the case that \llbracket \varphi \rrbracket = \left\lbrace 1 \right\rbrace we have that \llbracket \lnot \varphi \rrbracket = \mathrm {Int}\left(\left\lbrace 0 \right\rbrace \right) = \emptyset and therefore X \Vdash \lnot \lnot \varphi .We remind the reader that a topological space X is called functionally...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.006513405591249466, 0.02820567972958088, -0.0031136139295995235, -0.0007512166048400104, 0.026053622364997864, -0.012439193204045296, 0.004078987054526806, -0.012133937329053879, 0.032570842653512955, 0.010485553182661533, -0.00905084889382124, -0.003062102012336254, -0.013011548668146133...
85e450e6ffb472b77dfa5cb625fbc6476a3ee97b
subsection
183
223
Reverse Reverse Mathematics
Therefore we have that for every neighbourhood U of t_{0}U \Vdash \lnot (x_{g}=0) \ .However t_{0} \notin \mathrm {Int}\left(\mbox{$\left\lbrace \,t \in T \, | \,g(t) \geqslant 0 \,\right\rbrace $}\right) and t_{0} \notin \mathrm {Int}\left(\mbox{$\left\lbrace \,t \in T \, | \,g(t) \leqslant 0 \,\right\rbrace $}\right)...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.041161175817251205, 0.05556301027536392, -0.03795737773180008, -0.002341823885217309, 0.029658015817403793, 0.008207825012505054, 0.03981863334774971, -0.005118448752909899, 0.031137865036725998, 0.0035051077138632536, -0.020641613751649857, 0.019466886296868324, 0.021312884986400604, -...
5b782af9d0a8c72a1690ec55ddb28fe3e3308c3f
subsection
184
223
Reverse Reverse Mathematics
By using an appropriate subsequence we may assume, without loss of generality, that f(t_n) > f(t_{n+1}). Now choose reals s_n,r_n such thatf(t_{n+1}) < s_n < r_n < f(t_n) \ .Let h: \mathbb {R}\rightarrow \mathbb {R} be the piece-wise linear function that is 0 for x \leqslant 0 and is otherwise such that h (x) = x for x...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.0632530078291893, 0.05076725780963898, 0.014859267510473728, 0.02052975445985794, 0.04005210101604462, 0.01521796640008688, 0.005250732414424419, 0.006853427272289991, -0.00559798302128911, 0.019919203594326973, -0.029932228848338127, 0.0022552201990038157, -0.031199119985103607, 0.0072...
9c609518821b86061c3bbbf7ba37ad78259533a6
subsection
185
223
Reverse Reverse Mathematics
Together we have the desired contradiction to (REF ).This nicely fits in with a result of Lubarsky and Hendtlass who showed in that there is a topological model satisfying [PR:LLPO]LLPO, but not [PR:LPO]LPO, which means that that model also does not satisfy [PR:WMP]WMP.Their space X_{U} is defined to consist of \mathbb...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.035299889743328094, -0.005911282729357481, -0.03767966106534004, -0.007322363089770079, 0.0018124755006283522, -0.027870744466781616, 0.007150745019316673, -0.005930351093411446, 0.02675713412463665, 0.004599359352141619, 0.00551846856251359, -0.0007298527052626014, 0.016948219388723373, ...
05cc531e5681a6f878d3c640e7a9b43081f840a4
subsection
186
223
Reverse Reverse Mathematics
In the second case \llbracket \lnot \varphi \rrbracket = \mathrm {Int}\left({\llbracket \varphi \rrbracket }^\prime \right) = \left\lbrace \omega \right\rbrace \cup (\mathbb {N}\setminus \llbracket \lnot \varphi \rrbracket ) and \llbracket \lnot \lnot \varphi \rrbracket = \llbracket \varphi \rrbracket . In both cases w...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.036886490881443024, 0.032187964767217636, -0.025887666270136833, -0.01553717628121376, -0.01766524277627468, 0.006876172963529825, -0.0011231463868170977, 0.04347663372755051, 0.029014931991696358, 0.010510667227208614, 0.0005253426497802138, -0.01543801836669445, -0.0086800716817379, -...
6595ace9c27335d104fe3c39ee85c667be3c6ce5
subsection
187
223
Reverse Reverse Mathematics
Then \left\lbrace \omega \right\rbrace \cup A is open and should hence contain U_{N} for some N \in \mathbb {N}. Consider M such that f(2M+1) > N. Since y_{2M+1} \in U_{f(2M+1)} \subset U_{N} \subset A, we get a contradiction.The following is actually a special case of *Theorem 3.2, where it is shown that in any spatia...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.02735266275703907, 0.021876027807593346, -0.020304737612605095, 0.04893884062767029, 0.02295915223658085, -0.062393974512815475, -0.036917705088853836, -0.013378853909671307, 0.007044111844152212, 0.03465992957353592, -0.008695492520928383, 0.03188347443938255, -0.007909847423434258, 0....
6efc90671ef001e3b1e25c41b02720dcf1abfa5b
subsection
188
223
Reverse Reverse Mathematics
This provides an alternative way of seeing that \mathbb {N}^{\mathbb {N}} satisfies [PR:KS]KS.Corollary 2.19 \mathbb {N}^{\mathbb {N}}\nVdash [PR:IIIa]{\textrm {III}_{a}} .Since [PR:PFP]{\textrm {PFP}} \vdash [PR:IIIa]{\textrm {III}_{a}} \Rightarrow [PR:WLPO]{\textrm {WLPO}} , and \mathbb {N}^{\mathbb {N}}\Vdash [PR:K...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.01593392714858055, 0.01984109729528427, -0.01162993535399437, -0.029899006709456444, -0.04548189789056778, -0.0329362228512764, 0.02469453401863575, 0.0015071602538228035, -0.007734212093055248, 0.05369305983185768, 0.011744403280317783, 0.017643313854932785, -0.0003841827856376767, 0.0...
4f99e2f2dfdaf0b6bd5e753a5d01cbdf541cc677
subsection
189
223
Overview
The following quick overview might be useful to compare the big three varieties and three topological models, discussed above.1mylightgray [Table: NO_CAPTION]We conclude this section by pointing out that topological models have been used to give models thatdo not satisfy [PR:BDN]BD-N, and [PR:BD]BD , separate [PR:LPO]...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.02086859755218029, -0.019434643909335136, -0.039632029831409454, 0.03462844714522362, -0.0009553332929499447, -0.0782877504825592, 0.013965790160000324, 0.011715703643858433, 0.0005115132662467659, 0.004301859997212887, -0.034872524440288544, 0.003361781593412161, 0.004824337549507618, ...
01d5a4d4e855bd0a4bf4a858c6aa7cb41b5b5e6b
subsection
190
223
Realizability and Other Methods
In a realizability model we extend intuitionistic logic by allowing witnesses of statements to be attached to statements. This is, in particular, interesting in a constructive context, where we want to attach computable objects (“realizers”) that describe the computational content of a formula. For example, we would li...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.0022080852650105953, 0.012996813282370567, 0.013690891675651073, 0.033529337495565414, -0.0462515689432621, -0.03895993158221245, 0.022652896121144295, 0.006990363355726004, 0.023598674684762955, 0.018549442291259766, -0.043810855597257614, 0.007901818491518497, 0.02004438079893589, 0.0...
97325fdcac831acbbd4eb00775ca0da23b917429
subsection
191
223
[PR:LLPOn]
In Richman introduced a natural weakening of [PR:LLPO]LLPO. [leftmargin=2em,rightmargin=3em,skipabove=1em,skipbelow=1em, innerleftmargin=-1em,innerrightmargin=0em, nobreak=true, linecolor=blueish, linewidth=5pt, bottomline=false, topline=false, rightline=false, backgroundcolor=blueish!10]([PR:LLPOn]\textrm {LLPO}_{n}) ...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.045691899955272675, -0.0029988170135766268, -0.03989265859127045, -0.010179189965128899, -0.011354299262166023, 0.06232655793428421, 0.009332195855677128, 0.04639391228556633, 0.0312548466026783, 0.021182483062148094, -0.10078466683626175, 0.007642023265361786, 0.0034204062540084124, 0....
359583dcd1b8d35cc364417ee35e40bea3fc66be
subsection
192
223
[PR:LLPOn]
The reader has probably already noticed that [PR:LLPOn]\textrm {LLPO}_{2} is simply [PR:LLPO]LLPO.Proposition 1.2 [PR:LLPOn]\textrm {LLPO}_{n} is equivalent to the statement that if x_{1}, \dots , x_n are real numbers such that x_{i}x_{j}=0 for i \ne j, then there is m such that x_{m}=0.Assume [PR:LLPOn]\textrm {LLPO}...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.046247515827417374, -0.004983436781913042, -0.04820120334625244, 0.009096871130168438, -0.02819114178419113, 0.01707952655851841, 0.019124796614050865, 0.041302233934402466, -0.007288180757313967, -0.012561618350446224, -0.06010650470852852, -0.02896956540644169, -0.015965312719345093, ...
a0ea49421608c95f47186b9a58f16eee0281b368
subsection
193
223
[PR:LLPOn]
Hence b^{(p)}_{m} = 0 for all m \in \mathbb {N} and therefore a^{(p)}_{m} = 0 for all m \in \mathbb {N}.Conversely let (a_{m})_{m \geqslant 1} and for 1 \leqslant i \leqslant n define a real numberx_{i} = \sum _{m \geqslant 1} \frac{a_{in+m}}{2^{m}} \ .It is easy to check that these numbers have the desired property. N...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.033232852816581726, 0.008949067443609238, -0.025054337456822395, 0.005271786358207464, -0.0027083707973361015, -0.0005955554661341012, 0.01632651686668396, 0.025939326733350754, 0.0032633959781378508, 0.002921988721936941, -0.06823568791151047, -0.023162292316555977, -0.001316993031650781...
cd31a8f743abdcc75b5521544961c8af284c71ce
subsection
194
223
[PR:LLPOn]
Is [PR:LLPOn]\textrm {LLPO}_{n} equivalent to the statement that whenever x_1, \dots , x_n are reals such that \prod _{i=1}^n x_i = 0, there exists j such that\prod _{i=1, \ i \ne j}^n x_i = 0 \ ?The forward direction is trivial. However the converse does not generalise straightforwardlyThe reason that [PR:LLPOn]\textr...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.048929572105407715, 0.03186679258942604, -0.023884834721684456, 0.01579604111611843, 0.0023732215631753206, 0.015155041590332985, 0.0016148971626535058, 0.050119996070861816, -0.0027967386413365602, 0.0011732566636055708, -0.02563994936645031, -0.021000338718295097, -0.003929932601749897,...
6c2165705b9ba5a05f29e8d3ecaaf3115cf4d7d9
subsection
195
223
Open Induction
Coquand , U. Berger , Schuster , and others have all investigated aspects of open induction. This principle is interesting, since, heuristically speaking, invocations of Zorn's Lemma in a classical proof can be replaced by using open induction. Now open induction is constructive at least for some sets, which also depen...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.07104668021202087, 0.01271851547062397, -0.043458107858896255, 0.016998711973428726, 0.004818081855773926, -0.008148394525051117, 0.016937674954533577, -0.011558818630874157, 0.03360068425536156, 0.018356777727603912, -0.04535024240612984, 0.01526679564267397, 0.029694337397813797, 0.01...
1ac7d55ca4014b7c5921b6626b3193aa3054f7f5
subsection
196
223
Open Induction
Furthermore there exists u_{1}, \dots , u_n such that\forall {\beta < \alpha } : {\beta \in \bigcup _{i =1}^n B_{u_{i}}} \ ,and therefore, with u_{n+1} = \overline{\gamma }m also\forall {\beta < \gamma } : {\beta \in \bigcup _{i =1}^{n+1} B_{u_{i}}} \ ,that is \gamma \in A.Along similar lines assume that \alpha is such...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.028447719290852547, 0.027837252244353294, -0.06080242246389389, -0.007504917215555906, 0.010171891190111637, -0.013468408025801182, -0.021625760942697525, 0.03165266662836075, 0.014292537234723568, 0.010851033963263035, -0.049508798867464066, 0.0032392856664955616, -0.00995059683918953, ...
4740e45701474c1843380376ecca7a1d006bf61d
subsection
197
223
Open Induction
Then [PR:OI]{\textrm {OI}{_{\mathbb {N}_{\infty }}}} holds.Let A \subset X progressive (since \mathbb {N} has the discrete topology openness is irrelevant here). We need to show that X \subset A. So let x \in X be arbitrary. Since X is decidable we can find natural numbers a_{1} < \dots < a_n such that \mbox{$\left\lbr...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.04276692494750023, 0.018117181956768036, -0.01614825427532196, -0.010630679316818714, -0.01817823387682438, -0.00031432241667062044, 0.0036383175756782293, -0.00895938090980053, 0.031167047098279, -0.0003107451484538615, -0.029427064582705498, -0.018147706985473633, -0.0017228111391887069...
ea8efee7932d9a2f5f3af7467c9fbf5b104e9373
subsection
198
223
Open Induction
Consider the setE = \mbox{$\left\lbrace \,\alpha \in 2^{\mathbb {N}} \, | \,F^{{2}{3}}(\alpha ) \in A \,\right\rbrace $} \ .Now 0 \in E, since F^{{2}{3}}(0)=0. Since E is the preimage of an open set under a continuous function it is also open. To see that it is progressive let \alpha \in 2^{\mathbb {N}} be such that \f...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.04845178872346878, 0.014790304936468601, -0.03694906458258629, -0.00886350404471159, 0.038871269673109055, -0.020564550533890724, -0.014691144227981567, 0.05641521140933037, 0.02109849639236927, 0.018108397722244263, -0.03154858201742172, 0.042227502912282944, -0.03432510048151016, 0.01...
9e09bd8f1bbaab0c702e46c7f675e093577f11f4
subsection
199
223
Open Induction
Since E is open there exists n \in \mathbb {N} such that \gamma \in E whenever \overline{\alpha }n = \overline{\gamma }n. If \overline{\alpha }n = 1^n we are done, since then A=[0,1] and thus contains an open neighbourhood of x. In the case that \overline{\alpha }n = u 0 1^{m} for some u \in 2^{\ast } and some m \in \m...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.0293743759393692, 0.010300105437636375, -0.04239065572619438, -0.01384792011231184, 0.01184130646288395, -0.0039254846051335335, -0.009491357021033764, 0.037507642060518265, 0.007049850188195705, 0.007381742354482412, -0.0177924782037735, 0.011971011757850647, -0.003744279034435749, -0....
5396ce7367b43f183c79b03c7f404ddb25e71fec
subsection
200
223
The Limited Anti-Specker Property
Douglas Bridges, James Dent, and Maarten McKubre-Jordens dB14,jD13 have considered various weakenings of the Anti-Specker property. One of them is the so-called Limited Anti-Specker property.[leftmargin=2em,rightmargin=3em,skipabove=1em,skipbelow=1em, innerleftmargin=-1em,innerrightmargin=0em, nobreak=true, linecolor=b...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.016301697120070457, -0.012218641117215157, -0.04719555005431175, -0.004934010561555624, 0.005655223503708839, -0.01427161693572998, -0.012752871960401535, 0.022544575855135918, 0.03709093853831291, 0.036175113171339035, -0.04102899134159088, 0.02103346213698387, -0.04444807395339012, -0...
3a346f1371372276e0cb5446763f14857b203c6c
subsection
201
223
The Limited Anti-Specker Property
It is an easy calculationIf \overline{\beta }K \ne \overline{\gamma }K, then *{F^p(\beta ) - F^p(\gamma )} \geqslant (1-2p)p^{M-1} to see that for all such n we have*{F^{{1}{3}}(\alpha )-F^{{1}{3}}(\alpha _n)} \geqslant 3^{-M} = 2\delta .Now either *{x-F^{{1}{3}}(\alpha )}< \delta or *{x-F^{{1}{3}}(\alpha )} >0. In the...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.007202798034995794, -0.016191035509109497, -0.048740968108177185, -0.023027589544653893, 0.006023950409144163, -0.03326715901494026, 0.06064389646053314, 0.035617224872112274, -0.005592850502580404, -0.002859373576939106, -0.03338924050331116, 0.007549966685473919, -0.03708220273256302, ...
a941c70e6b79bc65928668af0ed4f9f68614cb03
subsection
202
223
The Limited Anti-Specker Property
Thus AS_{[0,1]}^{L} \Rightarrow AS_{2^{\mathbb {N}}}^{L}.To see that the converse holds we can use *Lemma 0.3 and the fact that there exists a point-wise continuous surjection 2^{\mathbb {N}}\rightarrow [0,1] (see Section ).As was shown in [PR:ASL]\textrm {AS}_{X}^{L} is equivalent to the following version of [PR:POS]P...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.03192882239818573, 0.013484280556440353, -0.029181599617004395, 0.014728161506354809, 0.013041672296822071, -0.029471585527062416, -0.02567126229405403, 0.016300182789564133, 0.031028343364596367, 0.050701502710580826, -0.0028693205676972866, -0.0038213091902434826, 0.02454184740781784, ...
f3b9b2f45135728efc6fae75626590744da4c7c5
subsection
203
223
Increasing Specker Sequences
As mentioned above Specker's original sequence is increasing. So it is natural to follow Dent and consider the following principle.[leftmargin=2em,rightmargin=3em,skipabove=1em,skipbelow=1em, innerleftmargin=-1em,innerrightmargin=0em, nobreak=true, linecolor=blueish, linewidth=5pt, bottomline=false, topline=false, righ...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.05043485388159752, 0.01859651692211628, -0.04921441152691841, -0.028710948303341866, -0.03926778957247734, 0.006170870736241341, 0.003770028240978718, 0.009565231390297413, 0.01630818471312523, 0.04881776496767998, -0.04088487848639488, 0.0035793338902294636, -0.030160225927829742, 0.00...
18a3653742d5ba6912a105a672fd743e319da675
subsection
204
223
Increasing Specker Sequences
Thus we have shown that[PR:FAN]{\textrm {FAN}_{c}} \Rightarrow [PR:ASL]{\textrm {AS}_{[0,1]}^{L}} \Rightarrow [PR:iAS]{\textrm {iAS}} \Rightarrow [PR:FAN]{\textrm {FAN}_{\Delta }}\ ,which of course raises the following question. quQuestion 13Are all of the implications [PR:FAN]{\textrm {FAN}_{c}} \Rightarrow [PR:ASL]{\...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
[ -0.04044010862708092, 0.004471302963793278, -0.06037021800875664, 0.0010691831121221185, -0.012673778459429741, -0.0037120969500392675, 0.010888309217989445, 0.019365470856428146, -0.004333958961069584, 0.051580216735601425, -0.021639274433255196, 0.0034431321546435356, -0.02447771281003952,...
b912b221db612ee56c3c0e2a5a70d31e069c9d8a
subsection
205
223
Increasing Specker Sequences
\end{array}\right.}Given x \in [0,1] there exists N and \varepsilon >0 such that for all n \geqslant N*{x_{k_{\ell _n}} -x}, *{x_{k_{\ell _n}} - (1-x)} > \varepsilon \ ,which means that also *{ (1-x_{k_{\ell _n}}) -x} > \varepsilon . In both cases *{y_n - x} > \varepsilon , and so (y_n)_{n \geqslant 1} is eventually bo...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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958dc4f5ad0e80745e5ef9a13ae42d6e476002a9
subsection
206
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Dirk Gently's Principle:
One statement that is notably missing from the list of the “paradoxes of material implication” equivalent to [PR:LEM]LEM (see Proposition REF ) is Dirk Gently's PrincipleThe name is based on the guiding principle of the protagonist of Douglas Adam's novel Dirk Gently's Holistic Detective Agency who believes in the “fun...
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1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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bd3b552136c17e3540dcd89688c119ec46029dad
subsection
207
223
Dirk Gently's Principle:
Now if [Pr:DGP]DGP holds, then either \varphi \Rightarrow \psi or \psi \Rightarrow \varphi . In the first case, if \varphi holds, then also \varphi \wedge \psi , and hence \vartheta holds. Together that means that in the first case we have \varphi \Rightarrow \vartheta . In the second case, similarly, we can show that ...
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1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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7996c284ed418914b6c7a3c8abb34172071efe0d
subsection
208
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Dirk Gently's Principle:
So we have that(\varphi \wedge \psi \Rightarrow \varphi ) \vee (\varphi \wedge \psi \Rightarrow \psi ) \ ,which is equivalent to the desired(\psi \Rightarrow \varphi ) \vee (\varphi \Rightarrow \psi ) \ .Hence [Pr:DGP]DGP holds.What makes the principle [Pr:DGP]DGP interesting for our point of view is that we can actual...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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0ff6403ea3386480b504cde1f63b7c6fa398836f
subsection
209
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Dirk Gently's Principle:
To see that [Pr:DGP]DGP fails consider \varphi and \psi such that \llbracket \varphi \rrbracket = \left\lbrace 1,2 \right\rbrace and \llbracket \psi \rrbracket = \left\lbrace 1,3 \right\rbrace . Then\llbracket \varphi \Rightarrow \psi \rrbracket = \mathrm {Int}\left(({\llbracket \varphi \rrbracket }^\prime \cup \llbrac...
{ "cite_spans": [] }
1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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f4e7e7aabf4561d96f72d6d03d9520424ae4a5f0
subsection
210
223
List of Open Questions
qu
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1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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7db7d6ab1013e86688382df8f9ec98dc5c58b4ec
subsection
211
223
Topological Models
The PythonVersion 2.7 or 3.x program used to check all possibilities in the proof of Proposition REF is[linenos, frame=lines, framesep=2mm, breaklines]pythontopology.pyoA80book author=Aberth, Oliver, title=Computable analysis, type=Book, language=English, publisher=McGraw-Hill, New York, date=1980, ISBN=0070000794,pA01...
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1804.05495
Constructive Reverse Mathematics
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2,018
en
Mathematics
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acd445731ce5acb7e09577fa20b48255ffc89e35
subsection
212
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Topological Models
V., series=Lecture Notes in Computer Science, publisher=Springer Berlin / Heidelberg, pages=3539,jB07bconference author=Berger, Josef, title=Weak König's lemma implies the fan theorem for c-bars, organization=University of Siena, date=2007, booktitle=Computation and logic in the real world, cie 2007, quaderni del dipar...
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1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
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2,018
en
Mathematics
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cc3f4f870188fd0f78c3721f9e153834895d8749
subsection
213
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Topological Models
(N.S.), volume=18, number=2, pages=195202,jB08barticle author=Berger, Josef, author=Bridges, Douglas S., title=The fan theorem and positive-valued uniformly continuous functions on compact intervals, date=2008, journal=New Zealand Journal of Mathematics, volume=38, pages=129135,dB10article author=Berger, Josef, author=...
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1804.05495
Constructive Reverse Mathematics
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[ "math.LO" ]
2,018
en
Mathematics
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c9052215b675653549ccd9709d25e94560e2be63
subsection
214
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Topological Models
Soc., volume=8, number=2, pages=179182,dB99barticle author=Bridges, Douglas S., title=Constructive mathematics: a foundation for computable analysis, date=1999, ISSN=0304-3975, journal=Theoretical Computer Science, volume=219, number=1–2, pages=95 109, url=http://www.sciencedirect.com/science/article/pii/S0304397598002...
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1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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1b772e63a5760a41d16ba1664e76f3f487ab0ee0
subsection
215
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Topological Models
Thesis, date=2013,rD87book author=Devaney, Robert, title=An introduction to chaotic dynamical systems, publisher=Addison–Wesley Publishing, date=1987,rD75article author=Diaconescu, Radu, title=Axiom of choice and complementation, date=1975, journal=Proceedings of the American Mathematical Society, volume=51, number=1, ...
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1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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d01581bd9cb957da817287d76297378e6829ea36
subsection
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Topological Models
Dolores Jiménez, editor=Loukanova, Roussanka, editor=Moss, Larry, publisher=Cambridge Scholars Publishing,rD05book author=Diestel, R., title=Graph theory, series=Graduate Texts in Mathematics, publisher=Springer, date=2005, ISBN=9783540261827,sE07book author=Elaydi, S.N., title=Discrete chaos, second edition: With appl...
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1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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4040edd35fe99bbbe55f03e586205ba6b5374282
subsection
217
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Topological Models
Thesis, date=2013,mH15article author=Hendtlass, Matthew, author=Lubarsky, Robert, title=Separating fragments of WLEM, LPO, and MP, date=2016, journal=The Journal of Symbolic Logic, volume=81, number=4, pages=13151343,bH76article author=Hillam, Bruce, title=A characterization of the convergence of successive approximati...
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1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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950da9ebc480d09846f597d93a726fafe00433e4
subsection
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Topological Models
Thesis, date=2004,iL12article author=Loeb, Iris, title=Questioning constructive reverse mathematics, date=2012, journal=Constructivist Foundations, volume=7, number=2, pages=131140, url=http://www.univie.ac.at/constructivism/journal/7/2/131.loeb,rL12article author=Lubarsky, Robert, title=On the failure of BD-n and BD, ...
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1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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cf658d00e50f47892f6a721c3242263276516734
subsection
219
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Topological Models
Soc., volume=20, pages=319320,mM89article author=Mandelkern, Mark, title=Brouwerian counterexamples, date=1989/02/01, journal=Mathematics Magazine, volume=62, number=1, pages=327, url=http://www.jstor.org/stable/2689939,pML98incollection author=Martin-Löf, Per, title=An intuitionistic theory of types, date=1998, bookti...
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1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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8018b1045f26a465f5aeec79b8261064731220ca
subsection
220
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Topological Models
Van, editor=Staal, J.F., series=Studies in Logic and the Foundations of Mathematics, volume=52, publisher=Elsevier, pages=161 178, url=http://www.sciencedirect.com/science/article/pii/S0049237X08711935,jM66article author=Myhill, John, title=Notes towards an axiomatization of intuitionistic analysis, date=196611, volume...
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1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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aea86463c4d2ad5d9e435b428b5b1653a01eab42
subsection
221
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Topological Models
1968, editor=A. Kino, J. Myhill, editor=Vesley, R.E., series=Studies in Logic and the Foundations of Mathematics, volume=60, publisher=Elsevier, pages=235 255, url=http://www.sciencedirect.com/science/article/pii/S0049237X08707559,Simpson:1999lrbook author=Simpson, S.G., title=Subsystems of second order arithmetic, pub...
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1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
[ "math.LO" ]
2,018
en
Mathematics
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c7aa65ec7c3a3f5df6171a06dfd2e11af84d5908
subsection
222
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Topological Models
II, series=Studies in Logic and the Foundations of Mathematics, publisher=North-Holland Publishing Co., address=Amsterdam, date=1988, volume=123, ISBN=0-444-70358-6,jvO08book author=van Oosten, Jaap, title=Realizability: An introduction to its categorical side, series=Studies in Logic and the Foundations of Mathematics...
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1804.05495
Constructive Reverse Mathematics
[ "Hannes Diener" ]
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2,018
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Mathematics
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696c6dafdf5327a6995eee3c23aad8c237d4b638
abstract
0
319
Abstract
In this thesis we discuss how one can derive the quantum spectral curve for the $\eta$-deformed AdS$_5 \times S^5$ superstring, an integrable deformation of the AdS$_5 \times $S$^5$ superstring with quantum group symmetry. This model can be viewed as a trigonometric version of the AdS$_5 \times $S$^5$ superstring, like...
{ "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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55d939468ccc2959bc2f2733f827b6fb832275b5
subsection
1
319
Abstract
Being able to solve an interacting quantum field theory exactly is by itself an exciting prospect, as having full control allows for the precise study of phenomena described by the theory. In the context of the AdS/CFT correspondence, which hypothesises a duality between certain string and gauge theories, planar \mathc...
{ "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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c94a3a8e8cea0c04010fc4baa520af2611a172df
subsection
2
319
Zusammenfassung
ngerman Die Möglichkeit eine exakte Lösung einer wechselwirkenden Quantenfeldtheorie zu finden ist isoliert betrachtet bereits eine interessante Aussicht, da sie uns unbeschränkte Kontrolle liefert. Sie ermöglicht es Phänomene, die von der Theorie beschrieben werden, sehr präzise zu analysieren. Im Kontext der AdS/CFT-...
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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
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Physics
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85a5d6726e395846cbdd08597593ab3651a3ce99
subsection
3
319
Zusammenfassung
B925, 2017, 252, arxiv:1708.02894 [hep-th].Other publications by the author: Arutyunov, Gleb and Frolov, Sergey and Klabbers, Rob and Savin, Sergei, Towards 4-point correlation functions of 1/2-BPS-operators from supergravity, JHEP 1704, 2017, 5, arxiv:1701.00998 [hep-th]. Klabbers, Rob, Thermodynamics of Inozemtsev'...
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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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e6e4fd8dc09fc6c33f547591e85d2211d272d98e
subsection
4
319
Introduction
The ultimate goal of physics is to understand nature. A daunting task, considering the huge amount of phenomena one needs to understand in order to reach this goal, ranging all the way from the interactions of elementary particles on ultra-short distance scales to colliding galaxies on ultra-long distance scales. Never...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1331, "openalex_id": "", "raw": "B. Lake, A. M. Tsvelik, S. Notbohm, D. A. Tennant, T. G. Perring, M. Reehuis, C. Sekar, G. Krabbes and B. Buchner, “Confinement of fractional quantum number particles in a condensed matter system”,...
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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ace63328ea188ab81e61e43199e845a706ead3fe
subsection
5
319
Introduction
Moreover, since we will compare our derivation of the \eta -deformed QSC with the undeformed construction it will be beneficial to have some of the background of the undeformed model available as well.We first discuss the construction of the {\rm AdS}_5\times {\rm S}^5 non-linear sigma model starting from its target sp...
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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
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Physics
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subsection
6
319
Introduction
A useful definition for these functions is the following: a function f: is \emph {real periodic} if there exists some R such that f(z+) = f(z) for all z. In particular, if we do not specify \omega it is understood that the function is defined on the standard cylinder with circumference \omega = 2\pi . The undeformed ca...
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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
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Physics
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subsection
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Introduction
This derivation is inspired by . As it turns out this solution can be further simplified by noticing that it can be recast into a beautifully-simple-looking form as was derived for the undeformed case in .This allows us to perform the next step: the basic building blocks for one of the T gauges can be interpreted as th...
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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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subsection
8
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Introduction
Obviously the second option is ludicrous and as we will see the boundary conditions do not uniquely specify the solution, rendering option one false.It turns out that there are still some constraints coming from the analytic properties of the T system that we have not revisited in the \mathbf {P} language: even though ...
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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
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Physics
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subsection
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Body
A prime example Making the first thing bold of a tractable model is the gauge theory known as \mathcal {N}=4 super Yang-Mills theory in four dimensions with gauge group SU(N) and gauge coupling g_{\textsc {YM}} (or \mathcal {N}=4 SYM for short). Its tractability is due to the large degree of symmetry present in the the...
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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
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Physics
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subsection
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Body
Therefore, even though the correspondence is believed to hold for all values of N, almost all of the evidence has been collected in the planar limit, which on the string theory side leads to free string theory: for large N the string coupling constant g_s tends to zero since it relates to the 't Hooft coupling \lambda ...
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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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subsection
11
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Body
By analysing eqn. (REF ) we find that the allowed matrices M_1,M_2 span \mathfrak {su}(2,2) and \mathfrak {su}(4) respectively, leaving a one-parameter freedom generated by the central element i\mathbb {I}_8, which is left fixed under the Cartan involution and has vanishing supertrace. Together this forms the bosonic s...
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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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subsection
12
319
Body
This \mathbb {Z}_4 grading is induced by the fourth-order automorphism \Omega : \mathfrak {sl}(4|4) \rightarrow \mathfrak {sl}(4|4) defined by\Omega (\mathbf {M}) = -\mathbf {K} \mathbf {M}^{st} \mathbf {K}^{-1}, \quad \text{ with } \mathbf {K} = \left( \begin{array}{c|c} K & 0 \\ \hline 0 & K \end{array}\right) \quad ...
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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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