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6f03bb937ef6ae23e118d69d74294f7b64a3c8af
subsection
68
84
Summary of results
In this paper we have computed the couplings of NS-NS and R-R fluxes to fermionic bilinears living on general brane intersections (including instantonic ones). The couplings have been extracted from disk amplitudes among two open string vertex operators and one closed string vertex representing the background fluxes. T...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1854, "openalex_id": "", "raw": "M. Grana, D3-brane action in a supergravity background: The fermionic story, Phys. Rev. D66 (2002) 045014, arXiv:hep-th/0202118.", "source_ref_id": "ad0470c84bc2a48b1dd9b1e88b0022420453c81f",...
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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9301f5947b7deccb1ad1ad4cd2d0988a5df7b456
subsection
69
84
Summary of results
For D3-branes in flat space one obtains{\mathcal {A}}_{\mathrm {D}3} = \frac{2\pi \mathrm {i}}{3!}\,c_F(\Lambda )\,{\mathrm {Tr}} \Big [\, \Lambda ^{\alpha A} \Lambda _{\alpha }^{{\phantom{\alpha }}B} \big (\overline{\Sigma }^{mnp}\big )_{AB}\,G_{mnp}^{\mathrm {IASD}} - \bar{\Lambda }_{\dot{\alpha }A}\bar{\Lambda }^{\d...
{ "cite_spans": [] }
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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06ecf9f3afd6b6cc6f1776a2e0c495258112e347
subsection
70
84
Summary of results
In particular for pure {\cal N}=1 SYM, the flux couplings for both gauge and exotic instantons follow from (REF ,REF ,REF ) by restricting the spinor components to A=B=0. The only contributions to fermionic mass terms come in this case from the components G_{(3,0)} and G_{(0,3)} related to the soft symmmetry breaking g...
{ "cite_spans": [] }
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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f42906105dc35e1efeb13cac49d41a991a2b4333
subsection
71
84
Summary of results
The presence of the \lambda ^2-term in (REF ) suggests that R-R and NS-NS fluxes can provide a valid alternative mechanism in the case of oriented gauge theories. A precise study of the low energy couplings generated by instantons in presence of such fluxes will be presented in the companion paper .AcknowledgmentsWe th...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 300, "openalex_id": "", "raw": "M. Billo', L. Ferro, M. Frau, F. Fucito, A. Lerda and J. F. Morales, Non-perturbative effective interactions from fluxes, arXiv:0807.4098 [hep-th].", "source_ref_id": "ce676f22f8766b2fb447e007...
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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5499fa955268806a9f159519a920a131ccb6fd59
subsection
72
84
Notations and conventions
We use the following notations for space-time indices in the real basis:d=10 vector indices: M,N, ... \in \lbrace 0, ..., 9\rbrace ; d=4 vector indices: \mu ,\nu , ... \in \lbrace 0, ..., 3\rbrace ; d=6 vector indices: m,n, ... \in \lbrace 4, ..., 9\rbrace .The corresponding complex indices are denoted by I, J=1, ......
{ "cite_spans": [] }
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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61eb3a3b1d15bf92c44db9b4c966b8d8fd00908b
subsection
73
84
Body
In a d=10 Euclidean space the \Gamma matrices which satisfy \left\lbrace \Gamma ^M,\Gamma ^N\right\rbrace = 2\delta ^{MN}, can be given the following explicit representation in terms of the Pauli matrices \tau ^c:\begin{aligned}\Gamma ^0 & = \tau ^1 \otimes ~\mathbf {1} \otimes ~\mathbf {1} \otimes ~\mathbf {1} \otimes...
{ "cite_spans": [] }
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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b8722dc93a41ed57793036000c745888a9128621
subsection
74
84
Body
In fact, by writing\Gamma ^\mu =\gamma ^\mu \otimes \mathbf {1}~~,~~ \Gamma ^m =\gamma _{(5)} \otimes \ \gamma ^m~~,~~ \Gamma _{(11)}^{\mathrm {E}} =\gamma _{(5)} \otimes \gamma _{(7)}~~,~~ C =C_4\otimes C_6~,we can read off the explicit representation of the Dirac matrices \gamma ^\mu and \gamma ^m for d=4 and d=6, re...
{ "cite_spans": [] }
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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2c126556ecfc05c7e18e11fc565a3f72e02f136b
subsection
75
84
Body
The matrices \big (\sigma ^\mu \big )_{\alpha \dot{\beta }} and \big (\overline{\sigma }^\mu \big )^{\dot{\alpha }\beta } act on spinors of definite chirality \psi _{\alpha } and \psi ^{\dot{\alpha }} as\big (\sigma ^\mu \big )_{\alpha \dot{\beta }} \,\psi ^{\dot{\beta }}\quad \mbox{and}\quad \big (\overline{\sigma }^\...
{ "cite_spans": [] }
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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1db36c7e0a07cc8594af1af79dbab88c58584598
subsection
76
84
Body
In this basis the matrices \gamma ^m\,C_6^{-1} may be written in the block diagonal form\gamma ^m \, C_6^{-1}= \begin{pmatrix} \Sigma ^m & 0 \\ 0 & \overline{\Sigma }^{\,m} \end{pmatrix}where (\Sigma ^m)^{AB} and (\overline{\Sigma }^{\,m})_{AB} are 4\times 4 anti-symmetric matrices.If we order the four chiral indices a...
{ "cite_spans": [] }
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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4b17d0f5e76ca80ab79277bd1d4b47d13c995e4c
subsection
77
84
Useful formulas
The previous formulas allow us to obtain the explicit expressions for the fermion bilinears which have been discussed in Sections and . In this respect we point out that in writing a fermion bilinear, like the one appearing for instance in Eq.(REF ), we always understand the inverse charge conjugation matrix C^{-1}. Th...
{ "cite_spans": [] }
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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14d21dca55c5bb2d6aa6560d138d4b612930afc7
subsection
78
84
Useful formulas
Indeed, computing the holomorphic and anti-holomorphic products \gamma ^{123} and \gamma ^{\bar{1} \bar{2} \bar{3}} and combining them with the charge conjugation matrix we find\begin{aligned}\gamma ^{123} \,C_6^{-1} &= -\,\begin{pmatrix} 0\phantom{0}& 0 \\ 0\phantom{0} & 1 \end{pmatrix} \otimes \begin{pmatrix} 0\phant...
{ "cite_spans": [] }
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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b3576c3cf39d4b2d8ce5135ce883d20c9a3cbcb6
subsection
79
84
The orbifold
The orbifold group \mathbb {Z}_2\times \mathbb {Z}_2 acting on the orthonormal complex coordinates Z^i of \mathcal {T}_6 as in Table REF is a discrete subgroup of \mathrm {SO}(6) that contains 4 elements h_I (I=0,1,2,3), with h^0\equiv e being the identity element, andh^1 = \mathrm {e}^{\mathrm {i}\pi (J_3 - J_2)}~,~~~...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1909, "openalex_id": "", "raw": "D. Friedan, E. J. Martinec, and S. H. Shenker, Conformal Invariance, Supersymmetry and String Theory, Nucl. Phys. B271 (1986) 93.", "source_ref_id": "96271dd998cb0396c24f487cab615e5468aeb35d"...
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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5e8bb099bfc58ca703408b62b4f3d319a0d5116c
subsection
80
84
The orbifold
Using this information, we easily deduce from (REF ) the transformation properties of the various spin fields, which are summarized in the following table\begin{}{c|c|c} irrep R_A & S^A & S_A \\ \hline R_0 & S^0 \equiv S^{+++} & \Big .S_{0} \equiv S_{---} \\ R_1 & S^1 \equiv S^{+--} & \Big .S_{1} \equiv S_{-++} \\ R_2 ...
{ "cite_spans": [] }
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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b9825fe126f1b85d3cf1ce402f87f6e2d4b10e89
subsection
81
84
Soft supersymmetry breaking on fractional D9 branes
In the orbifold \mathcal {T}_6/{\mathbb {Z}_2}\times {\mathbb {Z}_2}, we can realize an \mathcal {N}=1 d=4 gauge theory using fractional D9 branes that completely wrap the internal compact space. Such brane configuration preserves a different \mathcal {N}=1 supersymmetry with respect to the fractional D3 branes conside...
{ "cite_spans": [] }
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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405b11b642a91d965dbdf690ec4dede1404450f7
subsection
82
84
Soft supersymmetry breaking on fractional D9 branes
Notice also that \int _{\mathcal {T}_6/(\mathbb {Z}_2\times \mathbb {Z}_2)}\!\!\! d^6y \sqrt{-g_{(6)}} = \frac{1}{4}\, (2\pi \sqrt{\alpha ^{\prime }})^6\, \mathrm {e}^{3\varphi /2}\mathcal {V} since it corresponds to the internal volume in the string frame, which is related by the factor of \mathrm {e}^{3\phi /2} to...
{ "cite_spans": [] }
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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d0982b66e5250b988b37cb2347bc594cbba4a6a2
subsection
83
84
Soft supersymmetry breaking on fractional D9 branes
(REF ) in the D3 case, since now the normalization c_F contains contains the topological factor \mathcal {C}_{(10)} suitable for D9 disk amplitude, namely \mathcal {C}_{(10)} = \frac{\mathcal {C}_{(4)}}{(2\pi \sqrt{\alpha ^{\prime }})^6}~.On the other hand to obtain the four dimensional couplings, we have to dimensiona...
{ "cite_spans": [] }
10.1088/1126-6708/2008/10/112
0807.1666
Flux interactions on D-branes and instantons
[ "Marco Billo'", "Livia Ferro", "Marialuisa Frau", "Francesco Fucito", "Alberto Lerda", "Jose F. Morales" ]
[ "hep-th" ]
2,008
en
Physics
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badedf8786f2c3fe1676ddbb76db79acc4101f76
abstract
0
1
Abstract
We consider perturbations of the complex quadratic map $ z \to z^2 +c$ and corresponding changes in their quasi-Mandelbrot sets. Depending on particular perturbation, visual forms of quasi-Mandelbrot set changes either sharply (when the perturbation reaches some critical value) or continuously. In the latter case we ha...
{ "cite_spans": [] }
0807.1667
Quasi-Mandelbrot sets for perturbed complex analytic maps: visual patterns
[ "A. V. Toporensky" ]
[ "cs.GR" ]
2,008
en
Computer Science
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4d982b6c34420e94b99ad20d5022c3b2f7ec0ae6
abstract
0
71
Abstract
In this article we present a method for formally proving the correctness of the lazy algorithms for computing homographic and quadratic transformations -- of which field operations are special cases-- on a representation of real numbers by coinductive streams. The algorithms work on coinductive stream of M\"{o}bius map...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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fbd78a13f32755b2cdd24acb820774678b236452
subsection
1
71
Introduction
Exact real numbers constitute one of the prime examples of infinite objects in computer science. The ubiquity and theoretical importance of real numbers as well as recent safety-critical applications of exact arithmetic makes them an important candidate for applying various approaches to formal verification. Among such...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 924, "openalex_id": "", "raw": "J. Barwise and L. Moss. Vicious Circles: On the Mathematics of Non-Wellfounded Phenomena. CSLI Publications, Stanford, California, 1996.", "source_ref_id": "7ae883f69cf4ae2ad0ebf19e58509aa507d...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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b5eb682e444ea0f6880b51a95cabb766e22f7f18
subsection
2
71
Introduction
All the lemmas in this article are formalised and proven in Coq, a list of their machine checked counterparts is given in Appendix . Most of the proofs of lemmas are omitted in the paper, however in some cases the proof is given in human language. In any case all the machine checked version of the statements and proofs...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 467, "openalex_id": "", "raw": "M. Niqui. http://homepages.cwi.nl/ milad/ETrees/coinductive-field/ and http://coq.inria.fr/contribs/CoinductiveReals.html [cited 9 July 2008], June 2007. Files for Coq 8.1.", "source_ref_id": ...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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596be224ae375ea5dc0fdd54e976bcc55ec76425
subsection
3
71
Related Work
The stream representation of exact real numbers have been recently formalised in a coinductive setting by Ciaffaglione and Di Gianantonio , , Bertot , Hou  and Gibbons . Ciaffaglione and Di Gianantonio use the Coq proof assistant to formalise a representation of real numbers in [-1,1] as ternary streams and to prove th...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 169, "openalex_id": "", "raw": "A. Ciaffaglione and P. Di Gianantonio. A certified, corecursive implementation of exact real numbers. Theoret. Comput. Sci., 351(1):39–51, February 2006.", "source_ref_id": "8ce36402f182e1f28b...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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6160beb651512457f5bc19be12eba5fb19e533d3
subsection
4
71
Related Work
The big picture that we are working on, i.e., the formalisation of the Edalat–Potts normalisation algorithm is related to the work in , , that reconcile the coalgebraic structure of real numbers with algebraic operations on them.The general issue of formalising functions from streams to streams within logical framewor...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 230, "openalex_id": "", "raw": "D. Pavlović and M. H. Escardó. Calculus in coinductive form. In Proc. of the 13th Annual IEEE Symposium on Logic in Computer Science, pages 408–417, 1998.", "source_ref_id": "9a22e285308aef35c...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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cf6b918facd6964798f3a6a91199e23b16a506b9
subsection
5
71
Type Theoretic Coinduction
The Coq proof assistant  is an implementation of Calculus of Inductive Constructions (CIC) extended with coinductive types. This is is an extension of Martin-Löf intensional type theory. Coinductive types are intended for accommodating infinite objects such as streams and infinite trees in type theory . This is in cont...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 123, "openalex_id": "", "raw": "The Coq Development Team. The Coq Proof Assistant Reference Manual, Version 8.1. LogiCal Project, July 2006. http://coq.inria.fr/V8.1/refman/index.html, [cited 9 July 2008].", "source_ref_id":...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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c3275c442c119cefb7f17e5f872786ece16c5a36
subsection
6
71
Type Theoretic Coinduction
When given a well-typed definition that satisfies a guardedness condition, this operator will introduce an infinite object that inhabits the coinductive type.The typing rule for this operator is given by the following judgement (here, let I be a coinductive type with parameters P_0,\dots ,P_i).\frac{\displaystyle \stru...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1616, "openalex_id": "", "raw": "E. Giménez. Un Calcul de Constructions Infinies et son Application a la Verification des Systemes Communicants. PhD thesis PhD 96-11, Laboratoire de l'Informatique du Parallélisme, Ecole Normale Su...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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883a0a0aa649b4b953544299d145a569d1d2323f
subsection
7
71
Type Theoretic Coinduction
From a coalgebraic point of view this treatment of coinductive types by means of constructors and cofixed point operator might seem unnatural: final coalgebras are about observations and not constructions; final coalgebra should be given using its destructor. Nevertheless, presenting the coinductive types in the Coq wa...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1045, "openalex_id": "", "raw": "M. Abbott, T. Altenkirch, and N. Ghani. Containers - constructing strictly positive types. Theoret. Comput. Sci., 342:3–27, September 2005.", "source_ref_id": "50fa9a667f139d8a14399d3850364ac...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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bdc2a1c3f7b3224eae93464326c630e92dc436de
subsection
8
71
Type Theoretic Coinduction
For instance, for the case of filter on prime numbers, one has to (1) consider a number theoretic constructive proof of the infinitude of primes, (2) from this proof extract a function \kappa that returns the nth prime number, (3) use \kappa to rewrite \mathsf {filter} in a way that it passes syntactic tests of product...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 379, "openalex_id": "", "raw": "M. Niqui. Productivity of Edalat–Potts exact arithmetic in constructive type theory. Theory Comput. Syst., 41(1):127–154, July 2007.", "source_ref_id": "d7c786aeb641ec2be49f6158eada107c5adbda3...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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34364660d0d6238778c329ef2c40d345df05e3a5
subsection
9
71
Type Theoretic Coinduction
This leads us to the following definition for a coinductive extensional equality on streams which we denote by \mathop {\cong }.CoInductive \mathop {\cong } \colon A^{\omega } \mathord {\rightarrow } A^{\omega } \mathord {\rightarrow } \textsf {Prop}:= | \mathop {\cong } _{c} \colon \forall (\alpha _{1} \alpha _{2}\col...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 753, "openalex_id": "", "raw": "The Coq Development Team. The Coq Proof Assistant Reference Manual, Version 8.1. LogiCal Project, July 2006. http://coq.inria.fr/V8.1/refman/index.html, [cited 9 July 2008].", "source_ref_id":...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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7c85cf11eb2137ea37e33c362967818aa27b20e3
subsection
10
71
Homographic and Quadratic Algorithms
The homographic and quadratic algorithms are similar to Gosper's algorithm  for addition and multiplication on continued fractions and form the basis of the Edalat–Potts approach to lazy exact real arithmetic , .Here we use a representation which is much simpler than the continued fractions but it is redundant enough t...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 212, "openalex_id": "", "raw": "R. W. Gosper. HAKMEM, Item 101 B. http://www.inwap.com/pdp10/hbaker/hakmem/cf.htmlitem101b, [cited 9 July 2008], February 29 1972. MIT AI Laboratory Memo No. 239.", "source_ref_id": "0ad79f3ae...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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301e6d75749d6e022b7c46513862dbde7f7a0028
subsection
11
71
Homographic and Quadratic Algorithms
We interpret each digit by a refining Möbius map as follows.\mathbf {L} =\left[\begin{} \frac{1}{2}&\frac{-1}{2}\\ \frac{1}{2}&\frac{3}{2}\\ \end{}\right]\hspace{5.0pt},\quad \mathbf {R} =\left[\begin{} \frac{1}{2}&\frac{1}{2}\\ \frac{-1}{2}&\frac{3}{2}\\ \end{}\right]\hspace{5.0pt},\quad \mathbf {M} =\left[\begin{} 1&...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 675, "openalex_id": "", "raw": "M. Niqui. Formalising Exact Arithmetic: Representations, Algorithms and Proofs. Ph.D. thesis, Radboud Universiteit Nijmegen, September 2004.", "source_ref_id": "0523616ca7874699aec53dd55466d4b...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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15c5e669d82c3380a3519ec1bf7a66f2892d1bfb
subsection
12
71
Homographic and Quadratic Algorithms
This enables us to state the homographic algorithm:\mathsf {homographic} \quad \!\mu \quad \!(x\colon \!\!\!\colon xs) := \\ {\left\lbrace \begin{array}{ll} \mathbf {L} \colon \!\!\!\colon \mathsf {homographic} \quad \!(\mathbf {L} ^{-1} \mathop {\circ }\mu )\quad \!(x\colon \!\!\!\colon xs)&\qquad \textbf {\upshape { ...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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c5f9c2b1cb68e758862335ac666b8ad19ab777f1
subsection
13
71
Homographic and Quadratic Algorithms
We start pushing \mu towards the infinity by absorbing digits (hence obtaining a new refining Möbius map) and emitting digits whenever the emission condition holds, i.e., whenever the range of Möbius map applied to the interval [-1,1] fits inside the range of a digit.\mu \mathop {\circ }\phi _0\mathop {\circ }\phi _1 \...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 687, "openalex_id": "", "raw": "P. J. Potts, A. Edalat, and M. H. Escardó. Semantics of exact real number arithmetic. In Proc. of the 12th Annual IEEE Symposium on Logic In Computer Science, pages 248–257, 1997.", "source_re...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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55e327f7b73205e245e2d6de583e1f4e3907f68d
subsection
14
71
Homographic and Quadratic Algorithms
With this notation we can present the quadratic algorithm:\mathsf {quadratic} \quad \!\xi \quad \!(x\colon \!\!\!\colon xs)\quad \!(y\colon \!\!\!\colon ys):= \\ {\left\lbrace \begin{array}{ll} \mathbf {L} \colon \!\!\!\colon \mathsf {quadratic} \quad \!(\mathbf {L} ^{-1} \mathop {\circ } \xi )\quad \!(x\colon \!\!\!\c...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1994, "openalex_id": "", "raw": "A. Ciaffaglione and P. Di Gianantonio. A certified, corecursive implementation of exact real numbers. Theoret. Comput. Sci., 351(1):39–51, February 2006.", "source_ref_id": "8ce36402f182e1f28...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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5b2b903e1c6ddb1a53205c1b6e7dfa74350bb09f
subsection
15
71
Homographic and Quadratic Algorithms
However, we mention that transferring the computation to the whole real line is possible. A possibility would be to first move to [0,+\infty ] via the inverse of the above conjugacy map. Form here we can follow  where a redundant sign bit is added by considering a fourth order elliptic Möbius map that leads to a cyclic...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 390, "openalex_id": "", "raw": "P. J. Potts. Exact Real Arithmetic using Möbius Transformations. Ph.D. thesis, University of London, Imperial College, July 1998.", "source_ref_id": "3776b425021ed0fec6518ae80deeb289f3ebc737",...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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fe6eb318eeb87a8fe143f95c2ce040199e2fb091
subsection
16
71
General Corecursive Version of the algorithms
Algorithms of the previous section specify partial functions into the coinductive type of streams. This partiality is problematic for us. Translating these specifications into the language of Coq means that we should ensure that the returned value is provably an infinite stream, which is obviously not always true for a...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 896, "openalex_id": "", "raw": "P. J. Potts. Exact Real Arithmetic using Möbius Transformations. Ph.D. thesis, University of London, Imperial College, July 1998.", "source_ref_id": "3776b425021ed0fec6518ae80deeb289f3ebc737",...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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74ba43a9600162a3672ea0656f5a30fd82a5e070
subsection
17
71
Homographic Algorithm
Let \mathbb {M} (resp. \mathbb {T}) be the set of Möbius maps (resp. quadratic maps) in Coq They can be considered as \mathbb {Q} ^{4} and \mathbb {Q} ^{8} respectively, forgetting about the refining and nonsingular properties. Those properties will enter the picture when we study the correctness of the algorithms.. We...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 2476, "openalex_id": "", "raw": "C. Dubois and V. V. Donzeau-Gouge. A step towards the mechanization of partial functions: domains as inductive predicates. In M. Kerber, editor, Proc. Workshop on Mechanization of Partial Functions...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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5d3a04c85c4ac792c618258837c1b565ebebd534
subsection
18
71
Homographic Algorithm
According to this method we need to define an inductively defined predicate E_h(\mu ,\alpha ) with the intended meaning that \mu and \alpha are in the domain of m_h which in turn means that the homographic algorithm should emit at least one digit when applied on \mu and \alpha . Thus, as a first step in the definition ...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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bb478512aaeadb4a0a1b20c32107eafd730ee36c
subsection
19
71
Homographic Algorithm
E_{h}(\mu ,\alpha )\longrightarrow \mathbf {DIG} \times \mathbb {M} \times \mathbf {DIG}^{\omega }as follows.Fixpoint \overline{m}_{h}(\mu \colon \mathbb {M} )(\alpha \colon \mathbf {DIG}^{\omega } )(t\colon \!E_{h} \mu \alpha ){struct t}\colon \mathbf {DIG} *(\mathbb {M} *\mathbf {DIG}^{\omega }):= match \operatorname...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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f33188a29eb295213c100cd515494ef3fd6c57b2
subsection
20
71
Homographic Algorithm
Thus we have to use \mathop {\oplus } \colon \textsf {Prop} {\times }\textsf {Prop} \longrightarrow \textsf {Set} — with left and right its coprojections— to transfer propositions into a boolean sum on which we can pattern match. Hence the need for the above lemma is inevitable, although its proof is quite trivial.The ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1179, "openalex_id": "", "raw": "Y. Bertot and P. Castéran. Interactive Theorem Proving and Program Development. Coq'Art: The Calculus of Inductive Constructions. EATCS Series. Springer-Verlag, 2004.", "source_ref_id": "78c9...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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736d7cba1c501b8a26cb3e26888b4754db10b3b1
subsection
21
71
Homographic Algorithm
E_{h}(\mu ,\alpha )\mathord {\rightarrow } \textsf {Prop} \hspace{5.0pt}.The Lemma REF enables us to prove the fixed point equations of the \overline{m}_{h} function. These are in fact unfolding of the body of the definition of \overline{m}_{h}; they are crucial for proving similar results for the homographic algorithm...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.019285617396235466, -0.01171021442860365, -0.01623409613966942, -0.021040242165327072, 0.01364030223339796, -0.03071356564760208, -0.005485110450536013, 0.014464212581515312, 0.011939078569412231, -0.01846170611679554, -0.05550717934966087, 0.013960711658000946, 0.00477181700989604, 0.0...
2e184f4ac50e86095ce5e50d177f46ff981ab4f4
subsection
22
71
Homographic Algorithm
If  \lnot \operatorname{\mathbf {Incl}(\mu ,\mathbf {L})} , \lnot \operatorname{\mathbf {Incl}(\mu ,\mathbf {R})} and \lnot \operatorname{\mathbf {Incl}(\mu ,\mathbf {M})} holds then for all t^{\prime } a proof of property E_{h}\big (\mu \mathop {\circ }(\mathsf {hd} (\alpha )),\mathsf {tl} (\alpha )\big ) we have \ove...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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067d167b8f9b02daee3748f73dcdb2c009074ef7
subsection
23
71
Homographic Algorithm
This predicate will be an inductive type with one constructor.Inductive P_{h}\colon \mathbb {M} \mathord {\rightarrow } \mathbf {DIG}^{\omega } \mathord {\rightarrow } \textsf {Prop}:= |P_{hab}\colon \forall (\mu \colon \mathbb {M} )(\alpha \colon \mathbf {DIG}^{\omega } ),(\forall (n\colon \mathbb {N} ), \Psi _{h} (n{...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.031115161255002022, -0.0272238589823246, -0.0028459918685257435, 0.0049595036543905735, -0.0113687077537179, -0.0606127604842186, -0.015542320907115936, 0.03427398204803467, 0.023744575679302216, 0.023988736793398857, -0.0634816437959671, -0.005806433968245983, 0.04474234953522682, -0.0...
1ab935cbec6bba71b71deef01125bcce2b572243
subsection
24
71
Homographic Algorithm
Then if \Psi _{h}(n+1,\mu ,\alpha ) holds then \Psi _{h}\big (n,\pi _{23}(\overline{m}_{h}(\mu ,\alpha ,t)),\pi _{33}(\overline{m}_{h}(\mu ,\alpha ,t))\big )\hspace{5.0pt}.\qquad \mathrm {{}}Finally we are ready to define the homographic algorithm as a function\bar{h}\colon \Pi (\mu \colon \mathbb {M})(\alpha \colon \m...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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92f92e0d17a600bcddbd69adb7d5e2f20ad220b2
subsection
25
71
Homographic Algorithm
Note the resemblance with the definition of the modulus of productivity \overline{m}_{h}.Fixpoint \overline{\delta }_{h} (\mu \colon \mathbb {M} )(\alpha \colon \mathbf {DIG}^{\omega } )(t\colon \!E_{h} \mu \alpha ){struct t}\colon \mathbb {N}:= match \operatorname{\mathbf {Incl}_{dec}(\mu ,\mathbf {L})} with | left \R...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.01314033754169941, -0.04270228371024132, -0.026356983929872513, 0.01668105646967888, 0.005292000249028206, -0.013857638463377953, -0.03849004954099655, 0.03992465138435364, 0.025349710136651993, 0.010248242877423763, -0.0403825007379055, -0.004017646890133619, 0.011705736629664898, 0.01...
227368a72dad45029ffa7f3c1d8c3f3dc02d17b7
subsection
26
71
Homographic Algorithm
Then for all n if \overline{\delta }_{h}(\mu ,\alpha ,t)=n then one of the following three cases always holds.(a) \;\operatorname{\mathbf {Incl}(\mu {\mathop {\circ }}\alpha _{0}{\mathop {\circ }}\ldots {\mathop {\circ }}\alpha _{n-1},\mathbf {L})} \wedge \pi _{13}\big (\overline{m}_{h}(\mu ,\alpha ,t)\big )=\mathbf {L...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.03290228173136711, -0.009438804350793362, -0.005715169478207827, -0.006909327115863562, -0.020373167470097542, -0.013398981653153896, -0.030597902834415436, 0.011338774114847183, -0.011086970567703247, 0.01857239194214344, -0.043462757021188736, 0.014200173318386078, 0.03586287796497345, ...
c9b00d46310e2dedd8d4a65b1654e505f1ae7004
subsection
27
71
Homographic Algorithm
Then there exist n\in \mathbb {N} and \phi \in \mathbf {DIG} that satisfy the following three conditions.P_{h}(\phi ^{-1}{\mathop {\circ }}\mu {\mathop {\circ }}\alpha _{0}{\mathop {\circ }}\ldots {\mathop {\circ }}\alpha _{n-1},\alpha |_{n})\hspace{5.0pt}; \operatorname{\mathbf {Incl}(\mu {\mathop {\circ }}\alpha _{0...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.0223393514752388, -0.012863438576459885, -0.02020307444036007, -0.011856336146593094, -0.026413537561893463, -0.0014915789943188429, 0.009529320523142815, -0.0036507444456219673, -0.00756852375343442, 0.040894441306591034, -0.045105960220098495, -0.015564302913844585, -0.00304991658776998...
adbac373e248f3bcd357274f896445a0298b8a67
subsection
28
71
Homographic Algorithm
If \textsf {\upshape rep} (\alpha ,r) holds then\textsf {\upshape rep} (\bar{h}(\mu ,\alpha ,p), \mu (r))\hspace{5.0pt}.By Lemma REF there exist n, \phi and p^{\prime } such that\operatorname{\mathbf {Incl}(\mu {\mathop {\circ }}\alpha _{0}{\mathop {\circ }}\ldots {\mathop {\circ }}\alpha _{n-1},\phi )} \hspace{5.0pt},...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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5139349b2a64670b86442490fc6953d911d9eedf
subsection
29
71
Homographic Algorithm
According to Lemma REF , from (REF ) it follows that \mu _{c} is refining.
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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87eb3214c3716faec521a7c0513fc8d02865914b
subsection
30
71
Homographic Algorithm
Note that by Properties (REF ) and (REF ) of rep we have\alpha _{n-1}^{-1}{\mathop {\circ }}\ldots \alpha _{0}^{-1}(r)\in [-1,1] \hspace{5.0pt};and thus according to the refining property r_1\in [-1,1] .From here and (REF ), according to the statement of the constructor \textsf {\upshape rep} _{\phi } of rep applied to...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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33682a4df5ce18cfe0da79b1e34ad11f9268cec4
subsection
31
71
Homographic Algorithm
By examining these predicates we observe that the only topological notion appears in the type of the constructors of E_{h}, in the form of the emission condition. We should follow this link to obtain the productivity predicate for a refining Möbius map.First we state some elementary properties of the interval predicate...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.029868604615330696, 0.010378463193774223, -0.02851024828851223, 0.023992564529180527, -0.014957196079194546, -0.024694636464118958, -0.03794243931770325, 0.0485651008784771, 0.010134263895452023, 0.04557366296648979, -0.04426109045743942, -0.020085377618670464, 0.008630912750959396, 0.0...
2c87d90adc6fe189452980637568fcce0b3fc3f3
subsection
32
71
Homographic Algorithm
The intended meaning is that for two digit sets \Phi _1 and \Phi _2, with the same number of elements, if \operatorname{\mathsf {red}}(\Phi _1) > \operatorname{\mathsf {red}}(\Phi _2) then \Phi _1 has more redundancy. Note that this intended meaning does not work for adding extra digits (which decreases \operatorname{\...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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186321c72d3945112334d85e8b50759ac871ca0d
subsection
33
71
Homographic Algorithm
The identity follows by straightforward calculation (See ). Since all the digits are refining, we can apply part (REF ) with \mu _2:=\alpha _{0}{\mathop {\circ }}\ldots {\mathop {\circ }}\alpha _{n-1}.Next we can prove that after finitely many absorption steps the emitting condition holds and thus the algorithm is `in...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 59, "openalex_id": "", "raw": "R. Heckmann. Contractivity of linear fractional transformations. Theoret. Comput. Sci., 279(1–2):65–82, May 2002.", "source_ref_id": "7e77509b89932f7c95b99dd29b6db33d1c58cce8", "start": 0...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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d1282095adca72d3c20be627230dff355f2d7d5e
subsection
34
71
Homographic Algorithm
This is possible because we are dealing with a decidable predicate \operatorname{\mathbf {Incl}} (see \operatorname{\mathbf {Incl}_{dec}}), on the well-founded set \mathbb {N} \times \mathbf {DIG} . The idea is that once we have a witness we can perform a search bounded by this witness to obtain the smallest witness. T...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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22f1ccb1093a4aaad3b7907b6aa99542f88db8db
subsection
35
71
Homographic Algorithm
Therefore by induction hypothesis we haveE_{h}(\mu \mathop {\circ }\alpha _{0},\alpha |_{1})\hspace{5.0pt}.Since 0<k we know by Lemma REF .REF that \operatorname{\mathbf {Incl}(\mu ,\phi )} does not hold for any \phi , i.e.\lnot \operatorname{\mathbf {Incl}(\mu ,\mathbf {L})} \hspace{5.0pt},\quad \lnot \operatorname{\m...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.024581070989370346, 0.00847596861422062, -0.019713683053851128, 0.0010280258720740676, -0.003896580310538411, -0.02332989312708378, -0.020262980833649635, 0.028899161145091057, 0.008376789279282093, 0.019652649760246277, -0.021407350897789, 0.03604003041982651, 0.02064443752169609, -0.0...
0fa3a4b221b399e4b9133428b4be5df5968e12c6
subsection
36
71
Homographic Algorithm
REF\lnot \operatorname{\mathbf {Incl}(\mu ,\mathbf {L})} \hspace{5.0pt},\quad \lnot \operatorname{\mathbf {Incl}(\mu ,\mathbf {R})} \hspace{5.0pt},\quad \lnot \operatorname{\mathbf {Incl}(\mu ,\mathbf {M})} \hspace{5.0pt}.From here together with the definition of \overline{\delta }_{h} and (REF ) we obtain\overline{\de...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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9684c35340191f71d85df51912c15e37cfe61c26
subsection
37
71
Homographic Algorithm
Then \Psi _{h}(n,\mu ,\alpha ) holds. By induction on n. If n=0 then by Lemma REF we know that E_{h}(\mu ,\alpha ) holds, and hence we can apply the constructor \Psi _{h0} to obtain the conclusion. Assume the conclusion holds for n=k and arbitrary refining Möbius maps. Let t_0 be the specific proof given by Lemma REF ...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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62502a80606c1bc0b740f1ef580c84805ebfa62d
subsection
38
71
Cofixed Point Equations
Next we show that \bar{h} satisfies the specification of the homographic algorithm. At this point we need to use the extensional equality \mathop {\cong } on streams to prove an extensional proof irrelevance for \bar{h}. The proof of this lemma uses Lemma REF .Let \mu \in \mathbb {M},\alpha \in \mathbf {DIG}^{\omega } ...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ 0.00010072274744743481, -0.016157597303390503, -0.0100698908790946, -0.010504727251827717, -0.006091521121561527, -0.019117536023259163, 0.01605079509317875, -0.018278377130627632, 0.006698003038764, 0.0013331162044778466, -0.06035831570625305, 0.0004896675236523151, 0.0026700468733906746, ...
956cc427933183c86b6d47e44685476c8b99bb46
subsection
39
71
Cofixed Point Equations
If  \lnot \operatorname{\mathbf {Incl}(\mu ,\mathbf {L})} , \lnot \operatorname{\mathbf {Incl}(\mu ,\mathbf {R})} and \lnot \operatorname{\mathbf {Incl}(\mu ,\mathbf {M})} holds then for all p^{\prime } a proof of property P_{h}\big (\mu \mathop {\circ }(\mathsf {hd} (\alpha )),\mathsf {tl} (\alpha )\big ) we have \bar...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1163, "openalex_id": "", "raw": "A. Bove and V. Capretta. Nested general recursion and partiality in type theory. In R. J. Boulton and P. B. Jackson, editors, Theorem Proving in Higher Order Logics, 14th International Conference, ...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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047efc8dd1b0c7a0cb70a6289e3bbed8fa0869dc
subsection
40
71
Quadratic Algorithm
In the case of the quadratic algorithm we follow the same method that we used for the homographic algorithm. We start by defining the inductive type for the domain of the modulus function.Inductive E_{q} \colon \mathbb {T} \mathord {\rightarrow } \mathbf {DIG}^{\omega } \mathord {\rightarrow } \mathbf {DIG}^{\omega } \...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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48f349a2fdc5c6b08862943b03d1e97935738aae
subsection
41
71
Quadratic Algorithm
Note that in this case the modulus function \overline{m}_{q} returns a quadruple \langle \phi ,\langle \xi ^{\prime },\langle \alpha ^{\prime },\beta ^{\prime }\rangle \rangle \rangle consisting of the emitted digit, the new quadratic map passed to the continuation of the quadratic algorithm and the remainder (unabsorb...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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368544b5186fd8b0f91859e3401018a1aad91b06
subsection
42
71
Quadratic Algorithm
For brevity we do not mention them here but their statement and proofs can be found in .Next we define the inductive predicate \Psi _{q} that ensures the validity of E_{q} for finite iterations of \overline{m}_{q}:Inductive \Psi _{q} \colon \mathbb {N} \mathord {\rightarrow } \mathbb {T} \mathord {\rightarrow } \mathbf...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 88, "openalex_id": "", "raw": "M. Niqui. http://homepages.cwi.nl/ milad/ETrees/coinductive-field/ and http://coq.inria.fr/contribs/CoinductiveReals.html [cited 9 July 2008], June 2007. Files for Coq 8.1.", "source_ref_id": "...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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87ccff3019e8be61a591b777033cc5bf1fae9ec8
subsection
43
71
Quadratic Algorithm
P_q(\xi ,\alpha ,\beta )\longrightarrow \mathbf {DIG}^{\omega }using the cofixed point operator of Coq:CoFixpoint \bar{q} (\xi \colon \mathbb {T} ) (\alpha \beta \colon \mathbf {DIG}^{\omega } ) (p\colon \!P_{q} \xi \alpha \beta ) \colon \mathbf {DIG}^{\omega }:= Cons \pi _{14}(\overline{m}_{q} \xi \alpha \beta (P_{q}_...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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5af45c69673415a40ea0514cdfbb712f4a207a10
subsection
44
71
Quadratic Algorithm
If  \lnot \operatorname{\mathbf {Incl}(\xi ,\mathbf {L})} but \operatorname{\mathbf {Incl}(\xi ,\mathbf {R})} holds then \bar{q}(\xi ,\alpha ,\beta ,p) \;\mathop {\cong } \; \textsf {\upshape Cons} \quad \!\mathbf {R} \quad \!\bar{q}(\mathbf {R} ^{-1}\mathop {\circ }\xi ,\alpha ,\beta )\hspace{5.0pt}. If  \lnot \ope...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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b9336dd2a3599828bcdde26550d55b07da4ee975
subsection
45
71
Quadratic Algorithm
We can prove the properties similar to those of \overline{\delta }_{h}.The main auxiliary lemma in this case is the following.Let \xi \in \mathbb {T}, \alpha ,\beta \in \mathbf {DIG}^{\omega } and p be a proof that P_{q}(\xi ,\alpha ,\beta ) holds. Then there exist n\in \mathbb {N} and \phi \in \mathbf {DIG} that satis...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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69293a1b88bf432b24e016548bf1bdc8813bc069
subsection
46
71
Quadratic Algorithm
If \operatorname{\mathbf {Incl}(\xi ,\phi )} then \phi ^{-1}\mathop {\circ } \xi is a refining tensor.From these we can prove the correctness of the quadratic algorithm. In particular we do not need any additional property of rep apart from those that were used for the homographic algorithm. The proof is quite similar ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 417, "openalex_id": "", "raw": "M. Niqui. http://homepages.cwi.nl/ milad/ETrees/coinductive-field/ and http://coq.inria.fr/contribs/CoinductiveReals.html [cited 9 July 2008], June 2007. Files for Coq 8.1.", "source_ref_id": ...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.020672613754868507, 0.01659911684691906, -0.04631885886192322, 0.009581107646226883, -0.007956285960972309, -0.036402106285095215, 0.009092898108065128, 0.01396736316382885, -0.004809624515473843, 0.03252694383263588, -0.042321644723415375, -0.00703326566144824, 0.01003880426287651, 0.0...
4d22adfa639e3a8f28d50ed12ab73a9bd26bbea1
subsection
47
71
Quadratic Algorithm
If \xi is bounded and for each r_1,r_2\in [-1,1] , \xi (r1,r2)\in [\frac{-1}{3},\frac{1}{3}] then \operatorname{\mathbf {Incl}(\xi ,\mathbf {M})}.Recall that there were two ways of composing a quadratic map and a Möbius map. Using the lemma above we can derive the following about these two products.Let \xi be a quadrat...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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1c6197dc64a431ae3be21d76b248588ff5cdac48
subsection
48
71
Quadratic Algorithm
If \xi ([-1,1],[-1,1])=[x,y], we consider the following three cases.\text{If } y\le 0:&\qquad \qquad \operatorname{\mathbf {Incl}(\xi ,\mathbf {L})} &\quad \text{by Lemma~\ref {lemma:incl_properties_quadratic}.\ref {item:incl_properties_quadratic_3}}\hspace{5.0pt},\\ \text{else if } 0\le x:&\qquad \qquad \operatorname{...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.04420908913016319, 0.05385027080774307, -0.02991512045264244, -0.016399161890149117, 0.016795791685581207, -0.04832794517278671, 0.010075950063765049, -0.00097727554384619, 0.029549000784754753, 0.009946282021701336, -0.016704261302947998, 0.007013501599431038, -0.001478784834034741, -0...
733431c801f61cb1177c24ddd7b0bb957938dbad
subsection
49
71
Quadratic Algorithm
Then for all 0<\varepsilon \in \mathbb {Q} ^{+} there exist 0<\vartheta _0,\vartheta _1\in \mathbb {Q} ^{+} such that for all x_0,x_1,y_0,y_1\in [-1,1] if |x_0-x_1|<\vartheta _0 and |y_0-y_1|<\vartheta _1 then\operatorname{\mathbf {diam}_2(\xi ,[x_0,y_0],[x_1,y_1])} <\varepsilon \hspace{5.0pt}.At this point we are rea...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.013571854680776596, -0.0026434219907969236, -0.015051865950226784, -0.0014952690107747912, 0.002155170775949955, -0.006557059474289417, -0.037808943539857864, 0.0032537358347326517, 0.01297679916024208, 0.00043341820128262043, 0.00024043029407039285, -0.01408299244940281, -0.0061756134964...
aa7f9b8063bd3d012d890e3d883c9047114b33ed
subsection
50
71
Quadratic Algorithm
Taken:=\max (\lceil \frac{2}{\vartheta _0}\rceil ,\lceil \frac{2}{\vartheta _1}\rceil )\hspace{5.0pt}.Letx_0:=l_n(\alpha )\hspace{5.0pt},\quad y_0:=l_n(\beta )\hspace{5.0pt},\quad x_1:=u_n(\alpha )\hspace{5.0pt},\quad y_1:=u_n(\beta )\hspace{5.0pt},Note that due to (REF ) we have|x_0-x_1|\le \frac{2}{n+1}\hspace{5.0pt}...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1717, "openalex_id": "", "raw": "R. Heckmann. Big integers and complexity issues in exact real arithmetic. In A. Edalat, A. Jung, K. Keimel, and M. Z. Kwiatkowska, editors, Third Workshop on Computation and Approximation (Comprox ...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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ca7bc2b9cfc851ae18ccd353f39e1798ce0d8796
subsection
51
71
Quadratic Algorithm
Then E_{q}(\xi ,\alpha ,\beta ) holds.Let n\in \mathbb {N} , \xi be a refining quadratic map and \alpha ,\beta \in \mathbf {DIG}^{\omega } . Then \Psi _{q}(n,\xi ,\alpha ,\beta ) holds.Let \xi be a refining quadratic map and \alpha ,\beta \in \mathbf {DIG}^{\omega } . Then P_{q}(\xi ,\alpha ,\beta ) holds.As expected t...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 829, "openalex_id": "", "raw": "P. J. Potts. Exact Real Arithmetic using Möbius Transformations. Ph.D. thesis, University of London, Imperial College, July 1998.", "source_ref_id": "3776b425021ed0fec6518ae80deeb289f3ebc737",...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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81e56a3abfb10de8e98f53e503abefeb90389596
subsection
52
71
General Corecursion?
Evidently the method for formalising the quadratic algorithm mimics precisely the one used for the homographic algorithm. This suggests that one can generalise this method to obtain a scheme in style of  for formalising specification of partial functions on coinductive types. Such a method would be the dual of the Bove...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 276, "openalex_id": "", "raw": "D. Cancila, F. Honsell, and M. Lenisa. Generalized coiteration schemata. In P. Gumm, editor, Proc. of 6th Workshop on Coalgebraic Methods in Computer Science, CMCS'03, Warsaw, 5-6 Apr. 2003, volume ...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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f6973c408e0f6a85e8b919dd6ecb87b227e6258d
subsection
53
71
General Corecursion?
There, this function is employed to provide a universal quantifier for total predicates on streams and is used for obtaining higher order functions such as the numerical integration. However, this function which is the basis for defining other functions in , itself does not satisfy the Coq guardedness condition and hen...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 428, "openalex_id": "", "raw": "A. K. Simpson. Lazy functional algorithms for exact real functionals. In L. Brim, J. Gruska, and J. Zlatuska, editors, Mathematical Foundations of Computer Science 1998, 23rd International Symposium...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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70459d2892fa6a06ae6848bb1f65beead96724c5
subsection
54
71
Representation
As it is the case with all algorithms, `to prove the correctness' of the homographic and quadratic algorithms can point to different concepts:(i) To prove that the algorithms satisfy their Haskell-like specification. (ii) To prove that the algorithms turn the set \mathbf {DIG}^{\omega } to a partial field and behave as...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1928, "openalex_id": "", "raw": "M. Niqui. Formalising Exact Arithmetic: Representations, Algorithms and Proofs. Ph.D. thesis, Radboud Universiteit Nijmegen, September 2004.", "source_ref_id": "0523616ca7874699aec53dd55466d4...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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551d9be124b7849d6d1a19629e109efba9e92e5b
subsection
55
71
Representation
This leads to the following definition for a binary predicate \textsf {\upshape rep} \colon \mathbf {DIG}^{\omega } \times [-1,1] \longrightarrow \textsf {Prop} with the intended meaning that \textsf {\upshape rep} (\alpha ,r) holds if \rho (\alpha )=\lbrace r\rbrace .CoInductive rep \colon \mathbf {DIG}^{\omega } \mat...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1859, "openalex_id": "", "raw": "Y. Bertot. CoInduction in Coq. In Lecture Notes of TYPES Summer School 2005, August 15­26 2005, Göteborg, Sweden. vol II, 2005. http://www.cs.chalmers.se/Cs/Research/Logic/TypesSS05/Extra/lectnotes...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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45becefa28edf6e7245c230868792b22cba818a6
subsection
56
71
Representation
The reason is due to the guardedness condition of Coq: even without the \mathop {\cong } clause in the constructors of rep we could find a proof X, by coinduction, for the property that\forall \alpha \beta r,\;\;\textsf {\upshape rep} (\alpha ,r) \rightarrow \alpha \mathop {\cong } \beta \rightarrow \textsf {\upshape r...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 2494, "openalex_id": "", "raw": "Y. Bertot. Affine functions and series with co-inductive real numbers. Math. Structures Comput. Sci., 17(1):37–63, March 2007.", "source_ref_id": "8b88f1c38e1c2b3dd287500cfa2775c9382a7a68", ...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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57a170b12beedb76de4063b1c2f377a3c83f6241
subsection
57
71
Representation
In fact this function calculates the limit of converging sequence of shrinking intervals that is obtained by successive application of the digits starting from the base interval. To be able to define {\mathopen {[\![}{\_}\mathclose {]\!]}} we should show this converging property. This proof is directly dependent on the...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 791, "openalex_id": "", "raw": "M. Niqui. Formalising Exact Arithmetic: Representations, Algorithms and Proofs. Ph.D. thesis, Radboud Universiteit Nijmegen, September 2004.", "source_ref_id": "0523616ca7874699aec53dd55466d4b...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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f1fc6cf1d27054a44c8ba2948501d4769da5a626
subsection
58
71
Representation
Hence if we define l_k(\alpha ) (resp. u_k(\alpha )) to be the lower bound (resp. upper bound) of the interval \alpha _0\mathop {\circ }\alpha _1\mathop {\circ }\ldots \alpha _{k-1}([-1,1]) we can defineNote that we could have equivalently used the upper bounds.{\mathopen {[\![}{\alpha }\mathclose {]\!]}} =\lim \limits...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 2096, "openalex_id": "", "raw": "M. Niqui. Formalising Exact Arithmetic: Representations, Algorithms and Proofs. Ph.D. thesis, Radboud Universiteit Nijmegen, September 2004.", "source_ref_id": "0523616ca7874699aec53dd55466d4...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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149a6efb77c038a3ee80cafaec4930dbf875a8c0
subsection
59
71
Representation
However, the \mathop {\cong } equality does not know anything about this redundancy and it distinguishes the two streams representing the same real number. Therefore for two different representations \alpha _1,\alpha _2 of a real number r, there are two different proofs \textsf {\upshape rep} (\alpha _1,r) and \textsf ...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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304d28a7e55414d0e52ad4afd894da0512a9446f
subsection
60
71
Coinductive Correctness
We are going to prove that the homographic and quadratic algorithms correspond to Möbius and quadratic maps on [-1,1] as a subset of the standard model of \mathbb {R}. We base our correctness proofs on the coinductive predicate rep and we prove that for the functions \bar{h} and \bar{q} of Section  we have&\forall \mu ...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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6473a03809d373cedbc9821818d7fd9f0804b85f
subsection
61
71
Final step: Refining, Productivity and Topological Correctness
So far we have shown that the homographic and quadratic algorithms are `correct' modulo the existence of the productivity predicates P_h and P_q. In this section we will prove that if a Möbius map (resp. quadratic map) is refining then irrespective of the used input stream(s) the property P_h (resp. P_q) is always sati...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.015389970503747463, -0.002905171597376466, -0.019731514155864716, -0.004887097515165806, -0.009774195030331612, -0.05383818969130516, 0.039890315383672714, -0.010995015501976013, 0.0034240204840898514, 0.03137509152293205, -0.03717399016022682, -0.015306038782000542, 0.04379694163799286, ...
c06bb34336acf93a83f0e62c28ccddc6f6a46535
subsection
62
71
Reexamining The Method
We can outline the path that we followed in this article in the following steps.Implementing algorithms in type theoretic language. Proving that they satisfy their Haskell-like specification. Proving that the algorithms correspond to partial Möbius and quadratic maps on [-1,1]: They are total on those subsets of \ma...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ 0.0178202074021101, 0.0035339088644832373, -0.019971447065472603, 0.024472270160913467, -0.0004274351231288165, -0.004050740506500006, 0.03881387412548065, 0.004741121083498001, -0.012091193348169327, 0.03789845481514931, -0.024197643622756004, -0.036403264850378036, 0.02226000279188156, -...
8ef96f829a0b0e00f75adbf5688585dd90f6fa97
subsection
63
71
Dependence on Representation
None of the steps above depend on the representation, although the specific proofs about this representation, as well as our choice of the base interval appeared frequently in our reasoning. In we show that as long as a representation satisfies a few properties with respect to the effect of its digits on the chosen bas...
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10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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30a8ea4bc5d2c7706f9d20d8262a67238ed13d05
subsection
64
71
Type Theoretic vs. Topological Properties
We pointed out this correlation throughout the article. Here we summarise it for all the above steps. Step REF above is purely type theoretic. It simply consist of writing a function parametrised by a proof obligation that passes the type checking in the functional programming language of Coq. The proofs (proof irrelev...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
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050bb499ab55e55ce150b5584e05a94def137429
subsection
65
71
Statistics on Formalisation
Finally we present some of the statistics pertaining to the formalised algorithms. They indicate the size (in kilobytes) and length (in number of linesNumber of lines is obtained using the command coqwc which disregards the commented and blank lines.) of the ASCII code of the formalisation.In Table REF we present the r...
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10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.02481163665652275, 0.0025463972706347704, -0.02621549367904663, -0.022202294319868088, -0.00730157969519496, 0.0009475077386014163, 0.033784110099077225, 0.0016823388868942857, 0.008911436423659325, 0.0566120371222496, -0.009376845322549343, -0.005016497801989317, 0.01451160293072462, 0...
10d7c9c6c768c1f79d070e5ebc5cc6cc44c0606d
subsection
66
71
Conclusions and Further Work
We have shown the correctness of the homographic and quadratic algorithms on a stream representation of real numbers in [-1,1]. Following the general set-up of the method is easily extensible to any admissible digit set for any compact proper subinterval of the extended real numbers [-\infty ,+\infty ]. Our correctnes...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 305, "openalex_id": "", "raw": "M. Niqui. Formalising Exact Arithmetic: Representations, Algorithms and Proofs. Ph.D. thesis, Radboud Universiteit Nijmegen, September 2004.", "source_ref_id": "0523616ca7874699aec53dd55466d4b...
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.04055642709136009, 0.0074193235486745834, -0.026915550231933594, 0.02528291754424572, 0.00447448156774044, -0.050962552428245544, 0.020018821582198143, 0.014159655198454857, 0.014968342147767544, 0.01585332117974758, -0.02543550170958042, -0.01229814812541008, 0.02867024950683117, 0.003...
9f6957e4fa4be31b840f52e330cb5b812b428328
subsection
67
71
Interval Predicates for Quadratic Algorithm
Let \xi =\left[ \begin{} a&b&c&d\\ e&f&g&h\\ \end{} \right] be a quadratic map and \phi =\left[\begin{} \phi _{00}&\phi _{01}\\ \phi _{00}&\phi _{01}\\ \end{}\right] \in \mathbf {DIG} .
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.029278988018631935, 0.0019605783745646477, -0.05800870805978775, -0.024137238040566444, -0.03341374918818474, -0.01591348834335804, 0.02621224708855152, -0.0055880299769341946, 0.021650278940796852, 0.02778376080095768, -0.008689100854098797, 0.008856931701302528, 0.025556176900863647, ...
9fd85f7009b7d7787be46f14c097c0931de04c23
subsection
68
71
Interval Predicates for Quadratic Algorithm
Then:\operatorname{\mathbf {Bounded}(\xi )} &:= (0{<}e{+}f{+}g{+}h \wedge 0{<}e{-}f{-}g{+}h \wedge 0{<}{-}e{-}f{+}g{+}h \wedge 0{<}{-}e{+}f{-}g{+}h \bigvee \\ &\quad \qquad e{+}f{+}g{+}h{<}0\wedge e{-}f{-}g{+}h{<}0\wedge {-}e{-}f{+}g{+}h{<}0\wedge {-}e{+}f{-}g{+}h{<}0)\hspace{5.0pt};\\\operatorname{\mathbf {Ref}(\xi )}...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.006617177743464708, 0.028909629210829735, -0.06889493018388748, -0.011235853657126427, -0.018245866522192955, 0.010579856112599373, 0.009481443092226982, 0.027231497690081596, 0.02338705025613308, 0.006659131031483412, -0.017010150477290154, -0.01225036010146141, -0.012555474415421486, ...
7385ccffdbf61cb2ffa8943f2413f9d3b514d75f
subsection
69
71
Correspondence with the formalised
In the following table we present the correspondence between the terms and lemmas in the article and their formalised version in . In the second column foo.bar refers to the Coq term bar in file foo.v which is available for public download at . Note that for notations that are overloaded between the homographic and qua...
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10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.03150099515914917, 0.01936761848628521, -0.03317982703447342, 0.023656271398067474, -0.00016800244338810444, -0.06733643263578415, 0.020863305777311325, 0.008256801404058933, 0.007203715853393078, 0.007661579176783562, 0.012179164215922356, 0.01012641005218029, 0.0004984032711945474, 0....
d397e2b19eca0780de57bdb73032714c00d262bd
subsection
70
71
Correspondence with the formalised
\operatorname{\mathbf {Bounded}(\mu )} is in fact formalised as digits.Bounded_M mu but we ignore mu. [c]|l|l| Item in article Formalised Version\mathop {\cong } digits.bisim\operatorname{\mathbf {Bounded}(\mu )} digits.Bounded_M\operatorname{\mathbf {Bounded}(\xi )} digits.Bounded_T\operatorname{\mathbf {Ref}(\mu )} d...
{ "cite_spans": [] }
10.2168/LMCS-4(3:6)2008
0807.1669
Coinductive Formal Reasoning in Exact Real Arithmetic
[ "Milad Niqui" ]
[ "cs.LO" ]
2,008
en
Computer Science
[ -0.025117160752415657, -0.002370947040617466, -0.04629736766219139, -0.017990967258810997, -0.030793700367212296, -0.0055468338541686535, -0.016465015709400177, 0.010834255255758762, 0.0089420760050416, 0.06433411687612534, -0.03399819880723953, -0.011604861356317997, -0.0029698831494897604,...
034bdd5f4a9a947d58f98d7ec3ae4cffdb486f69
abstract
0
15
Abstract
The LHCb collaboration has studied various promising ways to determine the Unitarity Triangle angle $\gamma$. Three complementary methods will be considered. The potential of the $B \to DK^{(*)}$ decays has been studied by employing the combined Gronau-London-Wyler (GLW) and the Atwood-Dunietz-Soni (ADS) methods, makin...
{ "cite_spans": [] }
0807.1670
$gamma$ measurements at LHCb
[ "Jacopo Nardulli" ]
[ "hep-ex" ]
2,008
en
Physics
[ -0.039253510534763336, 0.012705501168966293, -0.06239049509167671, -0.03827675059437752, -0.047800153493881226, -0.012446049600839615, 0.04288583621382713, -0.03078317828476429, -0.008012478239834309, 0.037299994379282, -0.033484525978565216, 0.03861251473426819, 0.030706867575645447, 0.01...
0886d9f4316994b5cab5b86a623a65448e667e12
subsection
1
15
Introduction
LHCb aims to study CP violation and rare B-meson decays with high precision, using the Large Hadron Collider (LHC), where all species of B-mesons are produced in 14 \mathrm {TeV} pp collisions , . In these events the b\bar{b} pairs are frequently produced in the same forward (or backward) direction. The LHCb detector i...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 196, "openalex_id": "", "raw": "LHCb Collaboration, LHCb Technical Proposal, CERN-LHCC/1998-004.", "source_ref_id": "6bb6183dc353425d5cf90260badacd145a2e0968", "start": 0 }, { "arxiv_id": "", "doi":...
0807.1670
$gamma$ measurements at LHCb
[ "Jacopo Nardulli" ]
[ "hep-ex" ]
2,008
en
Physics
[ -0.018573418259620667, -0.029485493898391724, -0.07667449116706848, 0.009172246791422367, 0.011705679818987846, -0.006238196510821581, -0.007520174607634544, -0.018832867965102196, 0.003197314217686653, 0.004483107477426529, -0.062359072268009186, 0.017444057390093803, 0.05204220116138458, ...
2130b22f45b04eaddc2a6256801359d9b99977a0
subsection
2
15
Event Selection
LHCb will collect large samples of all types of B mesons and baryons. These samples will allow the precise measurement of all the three (\alpha , \beta and \gamma ) angles of the Unitarity triangle and of the B_s mixing phase. Here, three complementary methods to extract the Unitarity Triangle angle \gamma will be cons...
{ "cite_spans": [] }
0807.1670
$gamma$ measurements at LHCb
[ "Jacopo Nardulli" ]
[ "hep-ex" ]
2,008
en
Physics
[ -0.003505449742078781, -0.011382222175598145, -0.06682859361171722, -0.018751677125692368, -0.0010384751949459314, -0.023344235494732857, 0.013670872896909714, 0.004970185924321413, -0.03503161296248436, 0.023649388924241066, -0.07750896364450455, 0.03411615267395973, 0.03338378295302391, ...
086df525747013092e677f9fb29d175c86daefd4
subsection
3
15
Extracting
Interfering tree diagrams in the B^{\pm } \rightarrow \tilde{D} K^{\pm } decays allow the determination of the Unitarity Triangle angle \gamma . Here, \tilde{D} can be a D^0 or a \overline{D^0} and the D^0 and the \overline{D^0} are reconstructed in a common final state.In LHCb this is done by employing the combined Gr...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 389, "openalex_id": "", "raw": "G. Wilkinson, CERN-LHCb/2005-066.", "source_ref_id": "ebdf581e8d2f78ffdde6a5e4ac9fe0726a818dc2", "start": 271 }, { "arxiv_id": "", "doi": "", "end": 389, ...
0807.1670
$gamma$ measurements at LHCb
[ "Jacopo Nardulli" ]
[ "hep-ex" ]
2,008
en
Physics
[ -0.01873764581978321, 0.011123569682240486, -0.03997771441936493, -0.029647594317793846, -0.032836657017469406, -0.019790492951869965, 0.08935476839542389, -0.02520732209086418, -0.028777848929166794, 0.06481882929801941, -0.04370082914829254, -0.017394883558154106, 0.057281043380498886, 0...
3c61039d8f8007bb5fb1e2d7366ac96e479ab26f
subsection
4
15
Extracting
Using the ADS method the following equations can be written for the decay rates for the neutral B^0 \rightarrow D^0 (\rightarrow K\pi ) K^{*0} channels (very similar equation can be written for the charged decays, see also ) :\Gamma (B^0 \rightarrow (K^+\pi ^-)_D K^{*0}) &=& N_{K\pi } (1+(r_B r_D)^2 + 2r_Br_D \cdot \\ ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1100, "openalex_id": "", "raw": "K. Akiba et al., CERN-LHCb/2007-050.", "source_ref_id": "f5be559240a4b2d8bb72fbb9463f0d13c4cbfcb3", "start": 0 }, { "arxiv_id": "", "doi": "", "end": 1100, ...
0807.1670
$gamma$ measurements at LHCb
[ "Jacopo Nardulli" ]
[ "hep-ex" ]
2,008
en
Physics
[ 0.00007988170546013862, 0.01716860570013523, -0.05878530442714691, -0.011018428951501846, -0.018954139202833176, -0.045569293200969696, 0.05338291451334953, 0.025546884164214134, 0.015360178425908089, 0.07068886607885361, -0.022891473025083542, 0.01313970610499382, 0.0269661545753479, 0.03...
1c202f860e377c2cdf99087e3842524939804441
subsection
5
15
Extracting
Further information can be added by including the decays to CP-eigenstates, such as \pi ^+\pi ^- or K^+K^- and so:\Gamma (B^0 \rightarrow D_{CP} K^{*0}) &=& N_{CP} (1+r_B^2 + \\ & & 2r_B\cos (\delta _B+\gamma ))\;\;\;,\\ \Gamma (\overline{B^0} \rightarrow D_{CP} \overline{K^{*0}}) &=& N_{CP} (1+r_B^2 + \\ & & 2r_B\cos ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 598, "openalex_id": "", "raw": "Particle Data Group, S. Eidelman et al., Phys. Lett. B592 (2004) 677.", "source_ref_id": "03905df0d97b9f083f5714054111540b270b1be7", "start": 429 }, { "arxiv_id": "", ...
0807.1670
$gamma$ measurements at LHCb
[ "Jacopo Nardulli" ]
[ "hep-ex" ]
2,008
en
Physics
[ 0.011200438253581524, 0.007812839932739735, -0.047487419098615646, -0.006080891937017441, -0.013168907724320889, -0.025437507778406143, 0.049745816737413406, 0.041932977735996246, -0.007690764497965574, 0.06622602790594101, -0.03396754339337349, 0.00679808622226119, 0.014404923655092716, 0...
bbbaa7cebf8403436ba7404a50ddc2eba7d8b157
subsection
6
15
Extracting
The time evolution of the flavour eigenstates |B^0\rangle and |\overline{B^{0}}\rangle is then given by the four decay equations:\Gamma _{B \rightarrow f}(t) &=& \left|A_f\right|^2 (1+|\lambda _f|^2) \frac{e^{-\Gamma t}}{2} \cdot \\ & & ( \cosh {\frac{\Delta \Gamma t}{2}} + D_f \sinh {\frac{\Delta \Gamma t}{2}} + \\ & ...
{ "cite_spans": [] }
0807.1670
$gamma$ measurements at LHCb
[ "Jacopo Nardulli" ]
[ "hep-ex" ]
2,008
en
Physics
[ -0.001179632032290101, 0.03243844956159592, -0.012275039218366146, -0.014578992500901222, -0.004668939393013716, -0.029524177312850952, 0.01676851138472557, -0.002261994406580925, 0.027876315638422966, 0.0076442440040409565, -0.0158377755433321, 0.0029886553529649973, -0.027357544749975204, ...
086eb57841d3291d0fb249ed52bb858b82f16f18
subsection
7
15
Extracting
A_{f} = \langle f |T| B^0\rangle ) and\lambda _f = \frac{q}{p}\frac{\overline{A}_f}{A_f} \;\;\; , \;\;\; \lambda _{\overline{f}} = \frac{q}{p}\frac{\overline{A}_{\overline{f}}}{A_{\overline{f}}} \;\;\; .For the B_{s}^0 \rightarrow D_s^{\mp } K^{\pm } decay channels (see Feynman diagrams in Fig. REF ) a B^0_s, as well a...
{ "cite_spans": [] }
0807.1670
$gamma$ measurements at LHCb
[ "Jacopo Nardulli" ]
[ "hep-ex" ]
2,008
en
Physics
[ 0.01617617905139923, 0.02734689973294735, -0.04465235769748688, -0.03180297836661339, -0.013291936367750168, -0.03448883444070816, 0.0378766767680645, 0.00437214644625783, 0.0357096791267395, 0.04529330134391785, -0.016725558787584305, 0.03430570662021637, 0.007691315375268459, 0.016923945...
e6f108f96f9cf4f389c151ebccc6834b6e9bdd56
subsection
8
15
Extracting
The terms \lambda _f and \overline{\lambda }_{\overline{f}} are calculated as\lambda _{D^{-}_s K^{+}} &=& \left(\frac{q}{p}\right)_{B_s} \frac{\overline{A}_{D^{-}_s K^{+}}}{A_{D^{-}_s K^{+}}} = \left(\frac{V_{tb}^*V_{ts}}{V_{tb}V_{ts}^*}\right) \left(\frac{V_{ub}V_{cs}^*}{V_{cb}^*V_{us}}\right) \cdot \\ & & \left|\frac...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1109, "openalex_id": "", "raw": "L. Fernandez, CERN-LHCb/2006-047.", "source_ref_id": "b3dd58d03f1d446d4f9a4be4f162d6f833459f5f", "start": 983 }, { "arxiv_id": "", "doi": "", "end": 1397, ...
0807.1670
$gamma$ measurements at LHCb
[ "Jacopo Nardulli" ]
[ "hep-ex" ]
2,008
en
Physics
[ 0.014559301547706127, 0.015223168767988682, -0.06647831946611404, -0.006756950635462999, -0.00587560934945941, -0.006489877589046955, 0.030415816232562065, 0.03623037785291672, 0.041388705372810364, 0.05368933081626892, -0.03235400468111038, 0.05020974949002266, -0.015406304970383644, 0.03...
f80979b3e26440635a7ff0c0b66bc325e5ff8232
subsection
9
15
Extracting
REF the B_{(s)}^0 \rightarrow h^+h^{\prime -} tree diagrams are shown. [Figure: The B_{(s)}^0 \rightarrow h^+h^{\prime -} tree diagram.]For a neutral B-meson decaying into a CP eigenstate f, the time-dependent CP asymmetry is given by:{\cal A}_{CP}(t) &=& \frac{\Gamma (\overline{B^0}_{d/s}(t) \rightarrow f)-\Gamma (B^0...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 2013, "openalex_id": "", "raw": "R. Fleisher, Phys Rev. Lett. B 459, 306 (1999).", "source_ref_id": "a5af8ff93f295434be253d9bef73db39770b8f83", "start": 849 }, { "arxiv_id": "", "doi": "", "en...
0807.1670
$gamma$ measurements at LHCb
[ "Jacopo Nardulli" ]
[ "hep-ex" ]
2,008
en
Physics
[ 0.006796203553676605, 0.008008994162082672, -0.06376684457063675, -0.04439270868897438, -0.011677876114845276, -0.0725538581609726, 0.03353098779916763, 0.02106746844947338, -0.005526205990463495, 0.05247797816991806, -0.022989626973867416, -0.006952569354325533, 0.02561352588236332, 0.017...
47264145e063e4a298637d781e3337b21d8e1820
subsection
10
15
Extracting
This system of four equations and five unknowns (d,d^{\prime },\theta ,\theta ^{\prime } and \gamma ) can be solved with the help of the U-spin symmetry, as a consequence d = d^{\prime } and \theta = \theta ^{\prime } . This results in an over-constrained system of three unknowns and four equations.
{ "cite_spans": [] }
0807.1670
$gamma$ measurements at LHCb
[ "Jacopo Nardulli" ]
[ "hep-ex" ]
2,008
en
Physics
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6069012a6a8592e0b2c2a4cfec8d8592ebdc134f
subsection
11
15
Sensitivity to
As a result of the event selection, the annual yields together with the total efficiencies and with the background to signal ratios are listed in Table REF  , . [Table: Summary of event yield (S),experimental efficiency (\epsilon _{tot}), and backgroundto signal ratios.]Both for the charged and neutral B-meson decays a...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 161, "openalex_id": "", "raw": "K. Akiba et al., CERN-LHCb/2007-050.", "source_ref_id": "f5be559240a4b2d8bb72fbb9463f0d13c4cbfcb3", "start": 0 }, { "arxiv_id": "", "doi": "", "end": 161, ...
0807.1670
$gamma$ measurements at LHCb
[ "Jacopo Nardulli" ]
[ "hep-ex" ]
2,008
en
Physics
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