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GÃ¶del s Correspondence on Proof Theory and constructive mathematics {dagger}. KURT GÃDEL. Collected Works. Volume IV Selected Correspondence AÂG;
http://philmat.oxfordjournals.org/cgi/content/full/14/1/76

 2. HeiDOK mathematics Subject Classification 2000. 03Fxx Proof Theory and constructive mathematics ( 0 Dok. ) 03F03 Proof Theory, general ( 0 Dok.http://archiv.ub.uni-heidelberg.de/volltextserver/msc_ebene3.php?anzahl=0&la=de&

 3. MSC2000 03Fxx Proof Theory and constructive mathematics ( 0 Dok. ) 03F03 Proof Theory, general ( 0 Dok. ) 03F05 Cutelimination and normal-form theorems ( 0 Dok.http://elib.uni-stuttgart.de/opus/msc_ebene3.php?anzahl=0&la=de&zahl=03F

4. Constructive Mathematics
This is often associated with set Theory and pure existence Proofs and the like. He was able to automatically translate this to a constructive Proof
http://www.cs.cornell.edu/Info/Projects/Nuprl/Intro/ConstrMath/constrmath.html
##### Context
Constructive mathematics is pertinent to the PRL project because all of our logics have had a constructive core. This means that they can make distinctions that are critical in expressing computational mathematics. For example, it is trivial to express the notion that a problem is decidable; using the constructive "or" logical operator and letting P name the problem, we say P or not P. Our logics also express classical reasoning. In some cases this is accomplished by defining the classical logical operators in terms of the constructive ones. In other cases we have shown that it is consistent to add classical axioms as a way to produce subtheories of the constructive logic (subtheories in the sense of subtyping). For many centuries there has been a strong computational theme in mathematics. Prominent points have been the Greek interest in ruler and compass constructions, the Arab interest in algorithms and the algebra of solving equations, and the European development of the eighteenth and nineteenth century theory of functions. A noncomputational tradition has also enjoyed great success. This is often associated with set theory and pure existence proofs and the like. Nowadays this is called "classical mathematics" even though its distinct existence dates from the 1800s. Its modern expression was brought into focus by

 5. MPIM - Conference Plan Such rates of convergence are not computable in general, but Proof mining techniques enable .. Bas Spitters constructive mathematics and quantum Theory?http://www.mpim-bonn.mpg.de/Events/This Year and Prospect/Trimestre on methods o

6. Constructive Mathematics (Stanford Encyclopedia Of Philosophy)
We already have reasons for doubting that (A) has a constructive Proof. .. Bridges, D., and Reeves, S., 1999, constructive mathematics, in Theory and
http://plato.stanford.edu/entries/mathematics-constructive/
Cite this entry Search the SEP Advanced Search Tools ...
##### Constructive Mathematics
First published Tue Nov 18, 1997; substantive revision Sun Oct 31, 2004
##### 1. Introduction
Before mathematicians assert something (other than an axiom) they are supposed to have proved it true. What, then, do mathematicians mean when they assert a disjunction P Q , where P and Q P Q hold, but also we can decide which one holds. Thus just as mathematicians will assert that P only when they have decided that P by proving it, they may assert P Q P or decide (prove) that Q With this interpretation, however, mathematicians run into a serious problem in the special case where Q P , of P P is to show that P implies a contradiction (such as 0=1). But it will often be that mathematicians have neither decided that P P . To see this, we need only reflect on the following: Goldbach Conjecture
which remains neither proved nor disproved despite the best efforts of many of the leading mathematicians since it was first raised in a letter from Goldbach to Euler in 1742. We are forced to conclude that, under the very natural interpretation of

7. Summer School And Workshop On Proof Theory, Computation And Complexity
Like for last yearÂs events on `Proof Theory and ComputationÂ´ (Dresden) and . order to give a logical account to Bishopstyle constructive mathematics.
http://www.ki.inf.tu-dresden.de/~guglielm/WPT2/
 Summer School and Workshop on Proof Theory, Computation and Complexity June 23-July 4, 2003 Call for Participation (Dresden) and For attending courses, we ask for a fee of 100 EUR (to be paid in cash at the school). Registration is requested before May 25, 2003; please send an email to PTEvent@Janeway.Inf.TU-Dresden.DE , making sure you include a very brief bio (5-10 lines) stating your experience, interests, home page, etc. We select applicants in case of excessive demand. A limited number of grants covering all expenses is available. Applications for grants must include an estimate for travel costs and they should be sent together with the registration. We provide assistance in finding an accommodation in Dresden. Week 1, June 23-27: courses on Denotational Semantics of Lambda Calculi Achim Jung (Birmingham, UK) Proof Theory with Deep Inference Alessio Guglielmi (Dresden, Germany) Semantics and Cut-elimination for Church's (Intuitionistic) Theory of Types, with Applications to Higher-order Logic Programming Jim Lipton (Wesleyan, USA)

8. Constructive Mathematics
Most recently constructive mathematics has been put forward in a new and .. For this purpose Hilbert introduced a new Theory called Proof Theory,
http://digitalphysics.org/Publications/Cal79/html/cmath.htm
##### by Allan Calder
It is commonly held that if human beings ever encounter another intelligent form of life in the universe, the two civilizations will share a basic mathematics that might well serve as a means of communication. In fact, since the time of Plato it has been generally believed that mathematics exists independently of man's knowledge of it and thus possesses a kind of absolute truth. The work of the mathematician, then, is to discover that truth. Not all mathematicians, however, have shared this belief in a "God-given" mathematics. For example, the 19th-century German mathematician Leopold Kronecker maintained that only counting was predetermined. "God made the integers," he wrote (to translate from the German). "All else is the work of man." From this point of view the work of the mathematician is not to discover mathematics but to invent it. Elements

9. 03: Mathematical Logic And Foundations
The first leads to Model Theory, the second, to Proof Theory. . Model Theory, Recursion Theory, Set Theory, Proof Theory and constructive mathematics.)
http://www.math.niu.edu/~rusin/known-math/index/03-XX.html
Search Subject Index MathMap Tour ... Help! ABOUT: Introduction History Related areas Subfields
POINTERS: Texts Software Web links Selected topics here
##### Introduction
Mathematical Logic is the study of the processes used in mathematical deduction. The subject has origins in philosophy, and indeed it is only by nonmathematical argument that one can show the usual rules for inference and deduction (law of excluded middle; cut rule; etc.) are valid. It is also a legacy from philosophy that we can distinguish semantic reasoning ("what is true?") from syntactic reasoning ("what can be shown?"). The first leads to Model Theory, the second, to Proof Theory. Students encounter elementary (sentential) logic early in their mathematical training. This includes techniques using truth tables, symbolic logic with only "and", "or", and "not" in the language, and various equivalences among methods of proof (e.g. proof by contradiction is a proof of the contrapositive). This material includes somewhat deeper results such as the existence of disjunctive normal forms for statements. Also fairly straightforward is elementary first-order logic, which adds quantifiers ("for all" and "there exists") to the language. The corresponding normal form is prenex normal form. In second-order logic, the quantifiers are allowed to apply to relations and functions to subsets as well as elements of a set. (For example, the well-ordering axiom of the integers is a second-order statement). So how can we characterize the set of theorems for the theory? The theorems are defined in a purely procedural way, yet they should be related to those statements which are (semantically) "true", that is, statements which are valid in every model of those axioms. With a suitable (and reasonably natural) set of rules of inference, the two notions coincide for any theory in first-order logic: the Soundness Theorem assures that what is provable is true, and the Completeness Theorem assures that what is true is provable. It follows that the set of true first-order statements is effectively enumerable, and decidable: one can deduce in a finite number of steps whether or not such a statement follows from the axioms. So, for example, one could make a countable list of all statements which are true for all groups.

10. Foundations And Logical Aspects Of Constructivism
Beeson, M. Extensionality and choice in constructive mathematics. Pac. Dragalin, A.G. Mathematical Intuitionism Introduction to Proof Theory.
http://www.math.uu.se/~palmgren/biblio/found.html
##### Foundations and logical aspects of constructivism
Aczel, P.: The type theoretic interpretation of constructive set theory: choice principles. In: A.S. Troelstra and D. van Dalen (eds.), The L.E.J. Brouwer Centenary Symposium, (North-Holland, Amsterdam 1982). Aczel, P.: The type theoretic interpretation of constructive set theory: inductive definitions. In: R.B. Marcus et al. (eds.), Logic, Methodology and Philosophy of Science VII, (North-Holland, Amsterdam 1986). Beeson, M.: The unprovability in intuitionistic formal systems of the continuity of effective operations on the reals. J. Symbolic Logic 41(1976), 18 - 24. Beeson, M.: Derived rules of inference related to the continuity of effective operations. J. Symbolic Logic 41(1976), 328 - 336. Beeson, M.: Continuity in intuitionistic set theories. In: M. Boffa et al. (eds.), Logic Colloquium '78, (North-Holland, Amsterdam 1979), 1 - 52. Beeson, M.: Extensionality and choice in constructive mathematics. Pac. J. Math. 88(1980), 1 - 28. Beeson, M.: Problematic Principles in Constructive Mathematics. In: D. van Dalen et al. (eds.), Logic Colloquium '80, (North-Holland, Amsterdam 1982), 11 - 55.

11. Read This: Essays In Constructive Mathematics
The essay that follows this one is a beautiful constructive Proof of the history and philosophy of mathematics and applications of game Theory to
http://www.maa.org/reviews/constructiveessays.html
##### Reviewed by Bonnie Shulman
As the Secret Master of MAA Reviews warned me when he asked me to review this book, it is NOT a book about the history/philosophy of mathematics, but rather a very serious book of mathematics. However, as the author makes clear in his preface, "history and philosophy were prominent among my motives for writing it" (p. ix). These essays are a walk down the road Kronecker opened, but most mainstream mathematicians bypassed in the late 19 th and early 20 th th century mathematics and his constructivist proclivities from his earlier books, especially Galois Theory (1984) and Advanced Calculus (1993). Last winter (2004) I taught a senior seminar on the History of the Proof, where we traced the evolution of Abel's proof of the insolvability of the quintic. We used Peter Pesic's book Abel's Proof for the history and philosophy and supplemented it with excerpts from other texts including Edwards' Galois Theory for more mathematical content. My (undergraduate) students found Edwards' writing telegraphic at best, and we spent the better part of two weeks decoding six pages of text and two problems.

12. 03Fxx
Proof Theory and constructive mathematics 03F55 Intuitionistic mathematics; 03F60 constructive and recursive analysis See also 03B30, 03D45, 26E40,
http://www.ams.org/msc/03Fxx.html

13. Avigad, Jeremy - Carnegie Mellon University - Proof Theory, Constructive Mathema
Carnegie Mellon University Proof Theory, constructive mathematics, Proof complexity, the history and philosophy of mathematics. URL. Title.
http://www.sciencecentral.com/site/494893
 Sunday, 23 December, 2007 Home Submit Science Site Add to Favorite Contact search for Directories Aeronautics and Aerospace Agriculture Anomalies and Alternative Science Astronomy ... Technology Category: Science Math Logic and Foundations People ... REPORT BROKEN LINK Avigad, Jeremy Popularity: Details document.write(''); Carnegie Mellon University - Proof theory, constructive mathematics, proof complexity, the history and philosophy of mathematics. URL Title Description Category: Related sites Aczel, Peter (Popularity: ): University of Manchester - Philosophy and foundations of mathematics and computing, mathematical logic, categorical logic. Awodey, Steve (Popularity: ): Carnegie Mellon University - Category theory, logic, history and philosophy of mathematics and logic. Baldwin, John T. (Popularity: ): University of Illinois, Chicago - Model theory (finite and infinite). Blass, Andreas R. (Popularity: ): University of Michigan, Ann Arbor - Set theory, finite combinatorics, theoretical computer science. Bouscaren, Elisabeth (Popularity: ): CNRS / University of Paris 7 - Model theory and algebraic geometry.

14. Proof Theory As An Alternative To Model Theory
Part D is titled Proof Theory and constructive mathematics. Particularly relevant is the article Proof Theory Some applications of cutelimination by
http://www.lix.polytechnique.fr/Labo/Dale.Miller/papers/ProofTheoryAsAlternative
A Short Article for the Newsletter of the ALP (Appeared August 1991)
##### LFCS, University of Edinburgh and CIS, University of Pennsylvania
While there have been several recent papers in which proof-theoretic analysis has been used to analyze logic programming languages, the subject of proof theory and the related notions of intuitionistic logic and linear logic do not seem to be well known to the logic programming community. Below are listed some books and articles that provide introductions to these subjects. (1) Handbook of mathematical logic, edited by Jon Barwise, New York: North-Holland Pub. Co. 1977. Part D is titled "Proof Theory and Constructive Mathematics." Particularly relevant is the article "Proof theory: Some applications of cut-elimination" by Helmut Schwichtenberg. (3) Collected Papers of Gerhard Gentzen, edited by M. E. Szabo, North-Holland Publishing Co., Amsterdam, 1969. Of particular importance is the paper "Investigations into Logical Deductions" (1935) which is remarkably readable even after so many years. (4) Jean-Yves Girard, Paul Taylor, and Yves Lafont, Proofs and Types. Cambridge University Press, 1989.

15. CiteULike: From Sets And Types To Topology And Analysis: Towards Practicable Fou
Pym and Eike Ritter Reductive Logic and Proof Search Proof Theory, semantics and control 46. constructivemathematics constructive-Proof-Theory
http://www.citeulike.org/user/Constructivity/article/1743635
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(16 November 2005) Citation format: Plain APA Chicago Elsevier Harvard MLA Nature Oxford Science Turabian Vancouver
##### Constructivity's tags
All tags in Constructivity's library Filter: abstract-stone-duality algorithmic-information-theory argumentation-games categorical-logic ... topos-theory CiteULike organises scholarly (or academic) papers or literature and provides bibliographic (which means it makes bibliographies) for universities and higher education establishments. It helps undergraduates and postgraduates. People studying for PhDs or in postdoctoral (postdoc) positions. The service is similar in scope to EndNote or RefWorks or any other reference manager like BibTeX, but it is a social bookmarking service for scientists and humanities researchers.

16. FAQ - Constructive Mathematics - Mathematics And Statistics - University Of Cant
I know of no Proof of this statement other than the constructive one in 12 the . D.S. Bridges and S. Reeves, Âconstructive mathematics, in Theory and
http://www.math.canterbury.ac.nz/php/groups/cm/faq/
UC Home Courses Departments Library ... Mathematics and Statistics Mathematics and Statistics
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Entire University
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Reception, Level 4 Erskine Building ( MSCS
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##### Constructive Mathematics
Contents
• What is constructive mathematics? Why chose CM at all? Why would a constructive approach interest people? ...
• References
• ##### What is constructive mathematics?
A general answer to this question is that constructive mathematics is mathematics which, at least in principle, can be implemented on a computer. There are at least two ways of developing mathematics constructively. In the first way one uses classical (that is, traditional) logic. Unfortunately, that logic allows us to prove theorems that no computer can implement, so in order to do things constructively, we have to work within a strict algorithmic framework such as recursive function theory [ ]. This can make the resulting mathematics appear rather hard to read and certainly different from normal analysis, algebra, or the like.
• 17. Constructive Mathematics (Stanford Encyclopedia Of Philosophy/Fall 1998 Edition)
To prove p and q (`p q ), we must have both a Proof of p and a Proof of q. . Bridges, Douglas, 1975, constructive MathematicsIts Set Theory and
http://www.seop.leeds.ac.uk/archives/fall1998/entries/mathematics-constructive/
This is a file in the archives of the Stanford Encyclopedia of Philosophy
##### Stanford Encyclopedia of Philosophy
A B C D ... Z
##### Constructive Mathematics
Constructive mathematics is distinguished from its traditional counterpart, classical mathematics, by the strict interpretation of the phrase `there exists' as `we can construct'. In order to work constructively, we need to re-interpret not only the existential quantifier but all the logical connectives and quantifiers as instructions on how to construct a proof of the statement involving these logical expressions. Although certain individualsmost notably Kroneckerhad expressed disapproval of the `idealistic', nonconstructive methods used by some of their nineteenth century contemporaries, it is in the polemical writings of L.E.J. Brouwer (1881-1966), beginning with his Amsterdam doctoral thesis (Brouwer [1907]) and continuing over the next forty-seven years, that the foundations of a precise, systematic approach to constructive mathematics were laid. In Brouwer's philosophy, known as intuitionism , mathematics is a free creation of the human mind, and an object exists if and only if it can be (mentally) constructed.

 18. Foundations Of Mathematics Intuitionistic logic, its semantics, Heyting arithmetic, constructive mathematics, Proof Theory of firstorder logic and mathematical theorieshttp://sakharov.net/foundation.html

 19. Constructive Mathematics And Computer Science 5 Bishop, E., mathematics as a numerical language in Intuitionism and Proof Theory, edited by Kino, Myhill and Vesley, NorthHolland Pub.http://portal.acm.org/citation.cfm?id=805890

20. Constructive Logic And Lambda Calculus
Additional material on type Theory and Proof Theory. Erik Palmgren s course notes on constructive mathematics give a nice brief introduction into the
http://www.cs.swan.ac.uk/~csetzer/foerelaesning/constrmath/index.html
##### Lecturer
Anton Setzer
House 2, Room 138,
Tel. 018 4713284,
##### Schedule
Weekly (with some exceptions to be announced),
Monday, 15.15 - 17.00, House 2, Room 314.
Friday, 13.15 - 15.00, House 2, Room 315.
First lecture: August 31, 1998.
Continuation after Christmas: from January 8 till (at the latest) January 18, 1999.
##### Topics covered
Intuitionistic Logic. Brouwerian counterexamples. Elementary constructive analysis and algebra. Relationship between classical and constructive logic: double-negation translation. Properties of disjunction and existence. Realizability. Kripke-models and completeness theorem. Proof theory for intuitionistic logic. Normalization.
##### Literature
Troelstra, A. S., van Dalen, D.: Constructivism in mathematics, vol. 1. North Holland, 1988.
Hindley, J. R., Seldin, J. P.: Introduction to combinators and lambda calculus. Cambridge University Press, 1986. (This book is not available any longer, but we are allowed to copy parts of it for this course).
##### Reference Literature
Troelstra, A. S., van Dalen, D.: Constructivism in mathematics, vol. 2. North Holland, 1988.

 21. From Sets And Types To Topology And Analysis : Towards Practicable Foundations F Pym and Eike Ritter Reductive Logic and Proof Search Proof Theory, An introduction to the Theory of c*algegras in constructive mathematics,http://www.bestprices.com/cgi-bin/vlink/0198566514BT?id=nsession

 22. JSTOR Handbook Of Mathematical Logic The section concludes with Martin s account of applications of logic to descrip tive set Theory. Part D. Proof Theory and constructive mathematics Firsthttp://links.jstor.org/sici?sici=0007-0882(197909)30:3<306:HOML>2.0.CO;2-N

 23. Intute: Science, Engineering And Technology - Search Results Centre for Experimental and constructive mathematics at Simon Fraser University recursion Theory, set Theory, Proof Theory and constructive mathematics,http://www.intute.ac.uk/sciences/cgi-bin/search.pl?term1=constructive mathematic

24. 03Fxx
03Fxx Proof Theory and constructive mathematics. 03F03 Proof Theory, general; 03F05 Cutelimination and normal-form theorems; 03F07 Structure of Proofs
http://www.ma.hw.ac.uk/~chris/MR/03Fxx.html
##### 03Fxx Proof theory and constructive mathematics
• 03F03 Proof theory, general
• 03F05 Cut-elimination and normal-form theorems
• 03F07 Structure of proofs
• 03F10 Functionals in proof theory
• 03F15 Recursive ordinals and ordinal notations
• 03F20 Complexity of proofs
• 03F25 Relative consistency and interpretations
• 03F30 First-order arithmetic and fragments
• 03F40 Godel numberings in proof theory
• 03F50 Metamathematics of constructive systems
• 03F55 Intuitionistic mathematics
• 03F99 None of the above but in this section
Top level of Index
Top level of this Section

25. Mhb03.htm
03E72, Fuzzy set Theory. 03E75, Applications of set Theory. 03E99, None of the above, but in this section. 03Fxx, Proof Theory and constructive mathematics
http://www.math.unipd.it/~biblio/math/mainb/mhb03.htm

26. Intuitionistic Logic : Disciplines & Methods : Logic Theory - Mega Net
Provides an introductory article on constructive mathematics with notes on Includes the rejection of Tertium Non Datur, Proof Theory, and semantics.
http://www.mega-net.net/library/sciences/mathematics/logic_theory/disciplines_an
 Login Search Mega Net: Home Library Sciences Mathematics ... Logic Theory : Intuitionistic Logic Bibliography of Constructive Mathematics Access a collection of links to bibliographies for a variety of aspects on constructive mathematics. Invites contributions and corrections. http://www.math.uu.se/~palmgren/biblio/bib.html Confessions of a Formalist, Platonist Intuitionist Math professor, Fred Richman at Florida Atlantic University writes a brief automathography on algebraists, formalists, and intuitionistic logic. http://www.math.fau.edu/Richman/html/Confess.htm Constructive Mathematics Provides an introductory article on constructive mathematics with notes on analysis, philosophical impact, and intuitionistic logic. http://www.math.fau.edu/Richman/html/construc.htm Implementing Mathematics Access this Cornell University text titled Implementing Mathematics with The Nuprl Proof Development System. Find an overview of the project and a table of contents. http://www.cs.cornell.edu/Info/Projects/NuPrl/book/doc.html Inductive Definitions in Type Theory Resource accompanies a math course at Goteborg University and includes exercises, handouts, and relevant papers. http://www.cs.chalmers.se/~peterd/kurser/tt/index.html

 27. Logical Methods In Computer Science Type Theory and constructive mathematics close popup. Constable, Robert Interactive Proof checking Program development and specification close popuphttp://www.lmcs-online.org/ojs/edBoard.php?op2=62

28. Browse MSC2000
Internet tools for mathematicians, ,Browse the mathematics subject Proof Theory and constructive mathematics. Classification, Topic, Xref
http://www.zblmath.fiz-karlsruhe.de/MATH/msc/zbl/msc/2000/03-XX/03Fxx/dir
 Contact Search Browse Instructions ... Main Changes 75th anniversary Zentralblatt MATH Home Facts and Figures Partners and Projects Subscription Service Database Gateway Database Mirrors Reviewer Service Classification ... Serials and Journals database Miscellanea Links to the Mathematical World Display Text version Printer friendly page Internal Browse MSC2000 - by section and classification TOP MSC2000 - Mathematics Subject Classification Scheme 03-XX Mathematical logic and foundations Proof theory and constructive mathematics Classification Topic X-ref Proof theory, general related... Cut-elimination and normal-form theorems related... Structure of proofs related... Functionals in proof theory related... Recursive ordinals and ordinal notations related... Complexity of proofs related... Relative consistency and interpretations related... First-order arithmetic and fragments related... Second- and higher-order arithmetic and fragments [See also related...

29. FOM: Priority Arguments In Applied Recursion Theory; Proof Cleansing
FOM priority arguments in applied recursion Theory; Proof cleansing ``Proof cleansing below. intuitionistic and constructive mathematics No priority
http://cs.nyu.edu/pipermail/fom/1999-August/003299.html
##### FOM: priority arguments in applied recursion theory; proof cleansing
Stephen G Simpson simpson at math.psu.edu
Wed Aug 4 19:18:00 EDT 1999

30. Foundations Of Mathematics
Proof Theory. Category Theory. constructive mathematics. Logic and Philosophy. Logic and mathematics. Logic and Computer Science / AI. General Resources
http://lgxserver.uniba.it/lei/logica/lgmat_fo.htm
 Related Pages Index HOME English HOME Italiano Foundations of Mathematics Research / Miscellaneous New Foundations home page Pagina curata da M. Randall Jones. Ecco un estratto dall'Introduction: "The subject of the home page which is developing here is the set theory "New Foundations", first introduced by W. V. O. Quine in 1937. This is a refinement of Russell's theory of types based on the observation that the types in Russell's theory look the same, as far as one can apparently prove." Reviews / On-Line Publications Bulletin of Symbolic Logic Dalla presentazione: "This is a hypertext bibliography containing all papers published in the Bulletin of Symbolic Logic, a publication of the Association for Symbolic Logic . This bibliography is part of the Hypertext Bibliography Project and should in no way be construed as an official source of information about BSYML." Journal of Symbolic Logic Dalla presentazione: "This is a hypertext bibliography containing all papers published since 1990 in the Journal of Symbolic Logic, a publication of the Association for Symbolic Logic." Non contiene i testi degli articoli. Modern Logic Rivista internazionale di storia della logica matematica, della teoria degli insiemi e dei fondamenti della matematica. Dalla presentazione: "Modern Logic seeks to provide a unique service to research logicians and historians of logic by providing an organ for rapid, low cost, communication between historians of logic and research logicians, and between the various specialities of modern mathematical logic".

 31. MSC 2000 : CC = 03F 03Cxx Model Theory. 03Dxx Computability and recursion Theory. 03Exx Set Theory. 03Fxx Proof Theory and constructive mathematics. 03F03 Proof Theory, generalhttp://math-doc.ujf-grenoble.fr/cgi-bin/msc2000.py?CC=03F&L=fr&C=msc2000&T=N

32. Re: Godel's Proof, Truth, Reality, Self-awareness, And All That Jazz
true Proof Theory turns out to be a subjective belief without any scientific foundation of truth as something external, constructive mathematics.
http://sci.tech-archive.net/Archive/sci.math/2007-09/msg03397.html
##### Re: Godel's proof, truth, reality, self-awareness, and all that jazz
On 15 Sep., 15:47, "T.H. Ray" <thray...@xxxxxxx>
wrote:
writes:
Many constructivists have commented on the
difficulty of explaining
the constructivist view to classically trained
mathematicians. It
always appears to the classical mathematicians
that
the
constructivists lack clarity and haven't thought enough about the topic. Can you name a few constructivists who have commented thus? As far as I have noticed, real constructivists don't encounter the problems you have. I have often wondered why. I was driving down the interstate through Winslow, Arizona, I had Seven Vices on my mind Sloth and Avarice, Fornication, Television, Whiskey, Beer and Wine. Austin Lounge Lizards Indeed. DP's "concrete objects" are not the point of constructive proofs, which are concerned merely with that group of statements that can be constructed in a finite number of steps. I think what DP among

33. Mathematics And Computation Â» Constructive Math
We investigate the relationship between constructive Theory of metric spaces us to conclude from a constructive Proof of existence of a function between
http://math.andrej.com/category/constructive-math/
@import url( http://math.andrej.com/wp-content/themes/andrej/style.css );
##### The Role of the Interval Domain in Modern Exact Real Arithmetic
Filed under: RZ Talks Computation Constructive math With Iztok Kavkler Abstract: I will review the data structures and algorithms that are used in modern implementations of exact real arithmetic. They provide important insights, but some questions remain about what theoretical models support them, and how we can show them to be correct. It turns out that the correctness is not always clear, and that the good old interval domain still has a few tricks to offer. Download slides: domains8-slides.pdf Comments (0)
##### Synthetic Computability (MFPS XXIII Tutorial)
Filed under: Synthetic computability Talks Tutorial Constructive math A tutorial presented at the Mathematical Foundations of Programming Semantics XXIII Tutorial Day.
##### Metric Spaces in Synthetic Topology
Filed under: Talks Constructive math With Davorin LeÃÂ¡nik. Abstract:
We investigate the relationship between constructive theory of metric spaces and synthetic topology. Connections between these are established by requiring a relationship to exist between the intrinsic and the metric topology of a space. We propose a non-classical axiom which has several desirable consequences, e.g., that all maps between separable metric spaces are continuous in the sense of metrics, and that, up to topological equivalence, a set can be equipped with at most one metric which makes it complete and separable.

34. Proof Theory On The Eve Of Year 2000
There is no Theory of theories and mathematics in Mizar has no I consider MartinLof s constructive type Theory to belong to Proof Theory.
http://www.ihes.fr/~carbone/papers/proofsurveyFeferman2000.html
##### Proof Theory on the eve of Year 2000
By Solomon Feferman An index of respondents with links to their answers is to be found below.
##### Index by author:
Date: Fri, 3 Sep 1999 18:14:06 +0200 From: Anton Setzer Date: Mon, 6 Sep 1999 21:26:45 -0700 From: Michael Beeson To: Solomon Feferman Date: Tue, 7 Sep 1999 15:44:01 -0400 (EDT) From: Gaisi Takeuti To: Solomon Feferman Subject: Proof Theory Dear Sol, I am now concentrating in some specific problem. So I don't claim that I have a nice global view of proof theory. Nevertheless I have an impression that proof theory is doing very well in many diversified directions. I think that is healthy. Of course I would be happier if more people would work on Bounded Arithmetic related to complexity theory. Gaisi Date: Wed, 8 Sep 1999 13:56:03 -0700 (PDT) From: Sam Buss Date: Thu, 9 Sep 1999 15:45:33 -0400 (EDT) From: Neil Tennant Date: Tue, 14 Sep 1999 11:43:43 -0600 From: detlefsen.1@nd.edu To: Solomon Feferman Date: Tue, 14 Sep 1999 21:39:24 +0200 (MET DST) From: Sergei Tupailo

35. PlanetMath:
Math for the people, by the people. 03Fxx Proof Theory and constructive mathematics 03F50, -, Metamathematics of constructive systems
http://planetmath.org/browse/categories/03Fxx/
 (more info) Math for the people, by the people. Encyclopedia Requests Forums Docs ... RSS Login create new user name: pass: forget your password? Main Menu sections EncyclopÂ¦dia Papers Books Expositions meta Requests Orphanage Unclass'd Unproven ... Classification talkback Polls Forums Feedback Bug Reports downloads Snapshots PM Book information News Docs Wiki ChangeLog ... About Browsing MSC leaves only (Case insensitive substrings, use '-' to exclude) 03Fxx - Proof theory and constructive mathematics Proof theory, general Cut-elimination and normal-form theorems Structure of proofs Functionals in proof theory Recursive ordinals and ordinal notations Complexity of proofs Relative consistency and interpretations First-order arithmetic and fragments Second- and higher-order arithmetic and fragments GÂ¶del numberings in proof theory Provability logics and related algebras (e.g., diagonalizable algebras) Metamathematics of constructive systems Linear logic and other substructural logics Intuitionistic mathematics Constructive and recursive analysis Other constructive mathematics Miscellaneous up top

36. Book Review For Bulletin Of The LMS
The shift began with the 1967 work of Bishop on constructive mathematics (especially on the Theory of descriptions and heuristics for Proof discovery.
##### University of St Andrews
Practical Foundations of Mathematics , Paul Taylor, Cambridge Studies in Advanced Mathematics , CUP 1999, ISBN 0-521-63107-6, hardback, pp xi + 572. This is a fascinating and rewarding book, an ``account of the foundations of mathematics (algebra) and theoretical computer science, from a modern constructive viewpoint''. It is intended for ``students and teachers of computing, mathematics and philosophy''. Mathematicians are now rarely interested in the foundations of their subject, either because (they think) the foundations impinge little on their own specialisms, or because they appear too restrictive, or (even worse) because their justification seems to be philosophical rather than mathematical. For many, Zermelo-Fraenkel set theory (including a choice axiom, usually in the form of Zorn's lemma) seems to be adequate, with occasional appeals to a set/class distinction, the continuum hypothesis or large cardinal axioms if apparently required. The underlying logic should of course be classical, following Hilbert and his enthusiasm for Cantor's paradise rather than Brouwer and his allegedly obscurantist views. In particular, it has been argued by some and felt by many that constructive mathematics is too limitative: that the results are too weak and some of the proofs are too difficult. Several events led to the need for an alternative point of view. The shift began with the 1967 work of Bishop on constructive mathematics (especially on real analysis, later extended [

 37. Zentralblatt MATH - MSC 2000 - Search And Browse 03Fxx Proof Theory and constructive mathematics ZMATH. 03F03 Proof Theory, general ZMATH. 03F05 Cutelimination and normal-form theorems ZMATHhttp://www.zentralblatt-math.org/msc/search/?pa=03Fxx

38. Proofs, Computer Science, Swansea
Our work covers reductive Proof Theory Â exploring the limits of areas of type Theory, which is used as a foundation of constructive mathematics and as
http://www.swansea.ac.uk/compsci/research/theory/proofs.html
##### Proofs
The analysis and manipulation of formal proofs plays a central role in Logic and Computer Science and is a major field of research in the Logic and Computation group at Swansea. Our work covers reductive proof theory Ã¢ÂÂ exploring the limits of provability Ã¢ÂÂ constructive Type Theory and interactive theorem proving Ã¢ÂÂ providing new paradigms for program verification and program development Ã¢ÂÂ as well as proof-theoretic approaches to the grand challenges in computational complexity theory.
##### Higher order methods for semantics and program synthesis
U Berger M Seisenberger
##### Proof theory
A Beckmann U Berger M Seisenberger A G Setzer One of the main aims in proof theory is to determine the limit of formal reasoning (Hilbert's Second Problem). A Setzer has determined the strength of various extensions (universes, W-type, reflection principles) of Martin-LÂ¶f type theory, including the Mahlo universe and the P3-reflecting universe, the strongest formal theories currently available in constructive logic. The more practical goal is to apply the expressiveness of dependent types to programming technology, in the areas of generative and of provably correct programming.
##### Bounded arithmetic
K T Aehlig A Beckmann One of the most challenging problems in theoretical computer science and mathematics is the understanding of the relationship between complexity classes, most notably the P vs NP problem, which has been identified as one of the

39. MFO
12.04.2008, Mathematical Logic Proof Theory, constructive mathematics. 0816, 13.04. 19.04.2008, Analysis of Boundary Element Methods. 0817, 20.04.
http://www.mfo.de/programme/schedule/2008/
##### Meetings at Oberwolfach in 2008
ID Date Title Combinatorics Set Theory Buildings: Interactions with Algebra and Geometry Stochastic Analysis in Finance and Insurance ... Mathematisches Forschungsinstitut Oberwolfach generated: December 24th, 2007

 40. DMG-FG2: People The main focus of my research is Proof Theory in the sense of the Theory of calculi. Another of my research interests is constructive mathematics,http://www.dmg.tuwien.ac.at/fg2/index.php?id=19

41. Textbookx.com - 9780387155241 Bibliography Of Mathematical Logic Proof Theory Co
Buy Bibliography of Mathematical Logic Proof Theory constructive mathematics (volume6) by D. Van Dalen at TextbookX.com. ISBN/UPC 9780387155241.
http://www.textbookx.com/detail-book-0387155244.html

42. Realization Of Constructive Set Theory Into Explicit Mathematics: A Lower Bound
Realization of constructive Set Theory into Explicit mathematics a lower J ger, Strahm (Correct) 0.4 Proof Theory Of Reflection Rathjen (1993)
http://nsdl.org/resource/2200/20061012063959568T

43. Reflections
Feferman s primary contributions have been to Proof Theory, In 1967, Bishop s book Foundations of constructive mathematics created a stir by pioneering
http://www-formal.stanford.edu/clt/Reflections/symposium.html
Reflections
##### Symposium themes
The symposium is centered around proof theoretically inspired foundational investigations that have been merging over the last decades with developments in set theory and recursion theory; however, they have sustained a special emphasis on broad philosophical issues. Feferman's primary contributions have been to proof theory, computation theory and, in more recent years, to an analysis of the development of mathematical logic in the twentieth century. Indeed, all of these matters are of intense interest in the current discussion concerning modern mathematical thought. The following paragraphs describe the main themes for the symposium.
##### Foundational reductions
The use of (quantifier-free) transfinite induction along proof theoretic ordinals is motivated by an extension of Hilbert's program: to prove the consistency of classical theories for analysis with appropriate constructive constructive theories have a distinguished epistemological status.
##### Formalization in restricted systems
The attempt to establish the consistency of stronger and stronger classical theories was accompanied by the systematic development of analysis in weaker and weaker formal theories. In the late seventies, a real turning point was reached: all of classical analysis, as Takeuti showed, can be developed in a system that is conservative over elementary number theory. Feferman and Friedman obtained similarly sweeping results; that led to the investigation of which weaker systems were still sufficient for which parts of mathematics. This is part of a more systematic enterprise that was pushed along by Friedman and Simpson under the name

44. NDJFL Editors
mathematics, Proof Theory Peter Aczel, Mathematical Logic constructive mathematics, Foundations of mathematics, Dependent Type Theories
http://www.nd.edu/~ndjfl/editors.html
##### NDJFL Editorial Board
The table below shows the areas of interest for each of our editorial board members. Papers submitted for publication should be sent to the Production Editor, Martha Kummerer , not to individual board members. Authors are welcome, however, to suggest potential editors/areas for their submissions.
##### Areas of Interest
Michael Detlefsen Philosophical Logic: Philosophy of
Mathematics, Proof Theory Peter Cholak Mathematical Logic: Computability Theory
##### Areas of Review
Peter Aczel Mathematical Logic: Constructive Mathematics, Foundations of Mathematics, Dependent Type Theories G. Aldo Antonelli Philosophical Logic: Knowledge Representation, Foundation of Mathematics, Alternative Set Theories Jeremy Avigad Mathematical Logic: Proof Theory Patrick Blackburn Applied Logic: Modal Logic, Logic and Natural Language, Logic and Computation Patricia Blanchette Philosophical Logic: Philosophy of Logic, Philosophy of Mathematics Sam Buss Mathematical Logic: Complexity Theory, Theories of Arithmetic, Proof Theory Philosophical Logic: Proof Theory, Categorical Logic, Substructural Logics

45. Dagstuhl Â· 2003
Algorithms in mathematics, via Proof Theory For instance, in usual constructive mathematics, one requires to have a test of irreducibility for
http://map.unican.es/dagstuhl/index.html
##### Constructive Algebra and Verification
5-10 january, 2003
##### Place
The meeting took place in the Schloss Dagstuhl . It was the seminar NÂº03021, and it has a web page in Dagstuhl . You'll find there a complete list of participants and a group picture.
##### General Presentation
The meeting was an attempt to bring together people from different communities: constructive algebra, computer algebra, designers and users of proof systems. Though the goals and interests are distinct, the meeting revealed that there is a strong core of common interests, the main one maybe the shared desire to understand in depth mathematics concepts in connections with algorithms and proofs. An interaction appears thus to be possible and fruitful. One outcome of this week was the decision to create a European group under the acronym MAP for "Mathematics, Algorithms, Proofs". As we said in our proposal: "If there is enough common interests and good interactions during the week, the Dagstuhl seminar could be the starting point of a european proposal on the same topic, with more ambitious goals." This is indeed what happened.
##### Summary of the meeting
Here are some common themes that emerged in the meeting on constructive algebra and verifications. There is no attempt to be exhaustive.

46. Michael Beeson
Foundations of constructive mathematics Metamathematical Studies, Springer, Some applications of Gentzen s Proof Theory to automated deduction,
http://www.cs.sjsu.edu/faculty/beeson/Papers/pubs.html
##### Publications, Chronological Order
1. Dissertation: The metamathematics of constructive theories of effective operations . Stanford, 1972. 2. The non-derivability in intuitionistic formal systems of theorems on the continuity of effective operations, Journal of Symbolic Logic 3. The unprovability in intuitionistic formal systems of the continuity of effective operations on the reals, Journal of Symbolic Logic 4. Derived rules of inference related to the continuity of effective operations, Journal of Symbolic Logic 5. Continuity and comprehension in intuitionistic formal systems, Pacific J. Math 6. Principles of continuous choice and continuity of functions in formal systems for constructive mathematics, Annals of Mathematical Logic 7. Non-continuous dependence of surfaces of least area on the boundary curve, Pacific J. Math 8. The behavior of a minimal surface in a corner, Arch. Rat. Mech. Anal 9. A type-free GÃ¶del interpretation, Journal of Symbolic Logic 10. Some relations between classical and constructive mathematics, Journal of Symbolic Logic 11. Goodman's theorem and beyond

 47. Record constructive mathematics proceedings of the new mexico state university conference held at las cruces,new mexico,aug. 1115,1980 A Proof Theory for generalhttp://bibli.cirm.univ-mrs.fr/PrintRecord.htm?record=19249626146910678089

48. Abstracts For 2003
When Bishop published Foundations of constructive Analysis he showed that it was possible to . Essentials of mathematics Introduction to Theory, Proof,
http://fcis.oise.utoronto.ca/~ghanna/philosophyabstracts/2003.htm
 Abstracts for 2003 See abstracts for pre-1986 (Return to references) Alvarez, C. (2003). Two ways of reasoning and two ways of arguing in geometry: Some remarks concerning the application of figures in Euclidean geometry Synthese This paper contains: (1) an analysis of what one may call the weak spots in the Elements' plane geometry: (i) the uses of superposition in I.4, I.8, and III.24, and (ii) reasonings involving (arcs and segments of) circumferences, with particular emphasis on I.2, I.7, II.23, and III.25; (2) an exposition of Hilbert's solution to the problems raised by (i); (3) an axiom system for arcs, segments, and circumferences (treated as point-sets), followed by a proof of III.24 based on it. Andrews, P. B. (2003). An introduction to mathematical logic and type theory: To truth through proof . Dordrecht: Kluwer Academic Publishers. Billinge, H. (2003). Did Bishop have a philosophy of mathematics? Philosophia Mathematica, 11 When Bishop published Foundations of Constructive Analysis he showed that it was possible to do ordinary analysis within a constructive framework. Bishop's reasons for doing his mathematics constructively are explicitly philosophical. In this paper, I will expound, examine, and amplify his philosophical arguments for constructivism in mathematics. In the end, however, I argue that Bishop's philosophical comments cannot be rounded out into an adequate philosophy of constructive mathematics. Brown, J. R. (2003).

49. Manchester Institute For Mathematical Sciences - Events
14.50 15.30 Michael Rathjen, School of mathematics, Leeds University Brouwerian principles and constructive set Theory
http://www.mims.manchester.ac.uk/events/workshops/constructive-set-theory-progra
You are here: MIMS events workshops constructive mathematics day MIMS EVENTS research seminars workshops constructive mathematics day colloquia short courses MIMS forum popular lectures ... postgraduate admissions CONTACT DETAILS MIMS
The University of Manchester
School of Mathematics
Sackville Street
Manchester
UK
mims@manchester.ac.uk
tel: +44 (0)161 306 3641
fax: +44 (0)161 306 3669
##### Programme
Constructive Mathematics Day will take place on Friday December 9th in room G15 of the Newman Building of the School of Mathematics.
Coffee - Common room Newman building Peter Schuster, Mathematical Institute, University of Munich
Problems as Solutions
It is folklore that if a continuous equation has approximate solutions and - in a quantitative manner - at most one solution, then it has a (of course, uniquely determined) exact solution. I first review the standard ways to validate this heuristic principle both in classical mathematics and in constructive mathematics with countable choice, and then indicate how this can be carried over to the choice-free way of doing completions put forward by Mulvey, Stolzenberg, Richman, et al. Moreover, I sketch how the crucial "at most one" hypothesis can be obtained, by invoking Brouwer's fan theorem or Goedel's Dialectica interpretation, from appropriate preconditions of a qualitative nature. Lunch Break The meaning of topological definitions in a predicative setting Michael Rathjen, School of Mathematics, Leeds University:

50. Project-LogiCal:Formalization Of Mathematics
A traditional formalism allowing to express mathematics is set Theory, When a Proof of existence is constructive, the user can request the computation
http://ralyx.inria.fr/2006/Raweb/logical/uid7.html
Team LogiCal Members Overall Objectives Scientific Foundations Application Domains Software New Results Contracts and Grants with Industry Other Grants and Activities Dissemination Bibliography Inria Raweb 2006
Project: LogiCal
##### Section: Scientific Foundations
Keywords mathematical language programming language predicate logic set theory ... type theory
##### Formalization of mathematics
A proof assistant implements a particular formalism allowing to express mathematics. A traditional formalism allowing to express mathematics is set theory, built on top of first-order predicate logic. Unfortunately, this formalism does not address exactly the needs of a proof assistant. Set theory has been elaborated at the beginning of the XX th century to study mathematically the properties of mathematical reasoning. For this purpose, being able to formalize mathematics ``in principle'' was enough. Nowadays, the problem is not to formalize mathematics ``in principle'' but to formalize them ``in facts''. Thus, the design of proof assistants has led to ask new questions in logic and, in particular, in proof theory.

51. ScienceStorm - Constructive Set Theory Forcing, Large Sets, And
constructive ZermeloFraenkel Set Theory (CZF) provides a standard set theoretical framework for the development of constructive mathematics in the style of
http://www.sciencestorm.com/award/0301162.html
Newsletter We expect major site improvements soon. To be informed of important news about our site, enter your email here. Of course, you can always unsubscribe later. Your address will not be released to others.
National Science Foundation Award #0301162
##### Constructive Set Theory: Forcing, Large Sets, and Mathematics
Investigator(s): Michael Rathjen (PI) Sponsor: Ohio State University Research Foundation , OH 43210 6142923732 Start Date/Expiration Date 2003-06-01 to 2006-05-31 (amended 2003-04-18) Awarded Amount to Date: Abstract: NSF Org: DMS - Division of Mathematical Sciences Award Number: Award Instrument: Standard Grant Program Manager: Christopher W. Stark
DMS Division of Mathematical Sciences

NSF Program(s): FOUNDATIONS Field Application(s): Other nsf.applications NEC Program Reference Code(s): UNASSIGNED, 0000 Program Element Code(s): Home About Us Contact Us

 52. Lorenzen: Constructive Mathematics As A Philosophical Problem Instead, they should join the big game of axiomatic setTheory You will become The probability for finding a constructive consistency Proof is veryhttp://www.numdam.org/numdam-bin/fitem?id=CM_1968__20__133_0

53. Publications By Sara Negri
Proof Theory, intuitionistic logic, linear logic (see also the reasoned Practicable Foundations for constructive mathematics (L. Crosilla, P. Schuster,
http://www.helsinki.fi/~negri/pub.html
##### Publications by Sara Negri
Preliminary versions of most of my published papers are available through this page.
• Book: Structural Proof Theory . Cambridge University Press. Contents . Connected to the book is an interactive sequent calculus proof editor that can be found through Aarne Ranta's home page . The book has also a web page
• Proof theory, intuitionistic logic, linear logic (see also the reasoned bibliography
• Equality in the presence of apartness: An application of structural proof analysis to intuitionistic axiomatics (with Bianca Boretti), in "Constructivism: Mathematics, Logic, Philosophy and Linguistics" G. Ronzitti and G. Heinzmann (eds), Philosophia ScientiÃ¦, pp. 61-79, Cahier spÃ©cial 6, 2006. pdf file
• Proof analysis in non-classical logics, in "Logic Colloquium '05: Proceedings of the Annual European Summer Meeting of the Association for Symbolic Logic, Athens, Greece, July 28-August 3, 2005". C. Dimitracopoulos, L. Newelski, D. Normann, and J. Steel (eds) ASL Lecture Notes in Logic, vol. 28, pp. 107-128, pdf file
• Decision methods for linearly ordered Heyting algebras (with Roy Dyckhoff), Archive for Mathematical Logic, vol 45, pp. 411-422, 2006
•  54. Schloss Dagstuhl : Seminar Homepage Algorithms in mathematics, via Proof Theory; A second theme is what one may call For instance, in usual constructive mathematics, one requires to have ahttp://www.dagstuhl.de/en/program/calendar/semhp/?semnr=2003021

55. CONSTRUCTIVISM IS DIFFICULT
constructive mathematics, with its stricter notion of Proof, proves fewer . Mathematical Intuitionism Introduction to Proof Theory, Translations of
http://www.math.vanderbilt.edu/~schectex/papers/difficult.html
##### Constructivism is Difficult
Eric Schechter In a recent issue of this M ONTHLY , Fred Richman [ ] discussed existence proofs. Richman's conclusion, as I understood it, was that once a mathematician sees the distinction between constructive and nonconstructive mathematics, he or she will choose the former. That conclusion, if extrapolated further than Professor Richman intended, suggests that any mathematician can learn constructivism easily if he or she so desires. But in fact constructivism is unusually difficult to learn. Learning most mathematical subjects merely involves adding to one's knowledge, but learning constructivism involves modifying all aspects of one's knowledge: theorems, methods of reasoning, technical vocabulary, and even the use of everyday words that do not seem technical, such as "or". I discuss, in the language of mainstream mathematicians, some of those modifications; perhaps newcomers to constructivism will not be so overwhelmed by it if they know what kinds of difficulties to expect. 1. INTRODUCTION.

56. Constructive Mathematics
A constructive Proof of a theorem is, in particular, a Proof of that theorem. Every theorem in constructive mathematics can be understood as referring to
http://www.math.fau.edu/Richman/HTML/CONSTRUC.HTM
##### Constructive Mathematics
The constructive approach to mathematics has enjoyed a renaissance caused in large part by the appearance of Errett Bishop's book Foundations of constructive analysis in 1967, and by the subtle influences of the proliferation of powerful computers. Bishop demonstrated that pure mathematics can be developed from a constructive point of view while maintaining a continuity with classical terminology and spirit. Much more of classical mathematics was preserved than had been thought possible, and no classically false theorems resulted, as had been the case in other constructive schools such as intuitionism and Russian constructivism. The computers created a widespread awareness of the intuitive notion of an effective procedure, and of computation in principle, in addition to stimulating the study of constructive algebra for actual implementation, and from the point of view of recursive function theory. In analysis, constructive problems arise instantly because we start with the real numbers, and there is no finite procedure for deciding whether two given real numbers are equal (the real numbers are not discrete). The main thrust of constructive mathematics was in the direction of analysis, although several mathematicians, including Kronecker and van der Waerden, made important contributions to constructive algebra. Heyting, working in intuitionistic algebra, concentrated on issues raised by considering algebraic structures over the real numbers, and so developed a handmaiden of analysis rather than a theory of discrete algebraic structures. Paradoxically, it is in algebra where we are most likely to meet up with wildly nonconstructive arguments such as those that establish the existence of maximal ideals, and the existence of more than two automorphisms of the field of complex numbers.

57. Bibliography Of Mathematical Logic: Proof Theory Constructive Mathematics:978038
Bibliography of Mathematical Logic Proof Theory constructive Mathematics0387155244Kister, JE; Van Dalen, D.; Ptroelstra, AS for \$266.18 at
http://www.ecampus.com/book/0387155244
 My Account Help Desk Market Place Shopping Cart No items in cart. Total: X Textbooks Sell Textbooks Books ... Clearance Search Advanced >> Other versions by this Author Bibliography of Mathematical Logic: Proof Theory Constructive Mathematics Author(s) Kister, J.E. Van Dalen, D. Ptroelstra, A.S. Format : Hardcover Pub. Date Publisher(s) : Springer Verlag New Price List Price eVIP Price Quantity: New Copy: Usually Ships in 5-7 Business Days Used Price N/A List Price eVIP Price N/A Currently no Marketplace items available at this time. document.write(""); Take 90 Days to Pay on \$250 or more with Quick, Easy, Secure Subject to credit approval. Related Items Bibliography of Mathematical Logic: Proof Theory Constructive Mathematics Retail Price: Our Price: Check Out These Items! eCampus.com 1GB USB Drive Retail Price Our Price eCampus.com Black Notebook Retail Price Our Price eCampus.com T-Shirt

58. Description
constructive mathematics also admits higher order objects, was an insuperable barrier to obtaining constructive consistency Proof for formal systems of
http://www.phil.cmu.edu/projects/bernays/b-description.html
##### Project Description
PAUL BERNAYS: Philosopher of Mathematics
Paul Bernays is arguably the greatest philosopher of mathematics in the twentieth century. His prominence in the field from the 1920's into the 1970's is widely acknowledged; but much of his work remains untranslated from the original German or (in one case) French. For this reason, neither the substance of his contribution to the development of twentieth century foundations of mathematics nor the positive insights he has brought to it are sufficiently well-known in the English speaking sphere.
Our project is to prepare and publish a volume of English translations of his papers on the philosophy of mathematics. The originals were written in either German or French, with Bernays himself supplying an English translation in one case. Some of these papers have been collected and published in German under the title Abhandlungen zur Philosophie der Mathematik
Bernays played a pivotal role in the discussion of foundations of mathematics in the twentieth century. As David Hilbert's assistant from 1917 into the 1930's, he was active in the development of the finitist conception of mathematics as the basis upon which the consistency of all of mathematics was to be proved; he was responsible for the writing of the two-volume Grundlagen der Mathematik , which expounds the results of the Hilbert school (and much other work) in foundations. But also, after the discovery in 1931 by GÃ¶del of his incompleteness theorems, which signaled the failure of Hilbert's project in its original form, Bernays was a leader in the search for a new understanding of contemporary mathematics.

59. Constructivism (mathematics) - Wikipedia, The Free Encyclopedia
See constructive Proof. Constructivism is often confused with In constructive mathematics, one way to construct a real number is as a function f that
http://en.wikipedia.org/wiki/Constructivism_(mathematics)
var wgNotice = ""; var wgNoticeLocal = ""; var wgNoticeLang = "en"; var wgNoticeProject = "wikipedia";
##### Constructivism (mathematics)
In the philosophy of mathematics constructivism asserts that it is necessary to find (or "construct") a mathematical object to prove that it exists. When one assumes that an object does not exist and derives a contradiction from that assumption , one still has not found the object and therefore not proved its existence, according to constructivists. See constructive proof Constructivism is often confused with intuitionism , but in fact, intuitionism is only one kind of constructivism. Intuitionism maintains that the foundations of mathematics lie in the individual mathematician's intuition, thereby making mathematics into an intrinsically subjective activity. Constructivism does not, and is entirely consonant with an objective view of mathematics.
##### Contents

60. Springer Online Reference Works
Such a Proof usually contains no method for constructing the required constructive object. constructive mathematics maintains that such an argument does not
http://eom.springer.de/C/c025340.htm
 Encyclopaedia of Mathematics C Article referred from Article refers to Constructive mathematics, constructive trend in mathematics Mathematics built up in connection with a certain constructive mathematical view on the world that usually seeks to relate statements on the existence of mathematical objects with the possibility of their construction, rejecting thereby a number of standpoints of traditional set-theoretic mathematics and leading to the appearance of pure existence theorems (in particular, the abstraction of actual infinity and the rejection of the universal nature of the law of the excluded middle ). The constructive trend in mathematics has emerged in some form or other throughout its history, although it appears to be C.F. Gauss who first stated explicitly the difference, being the principal one in constructive mathematics, between potential infinity and the actual mathematical infinity; he objected to the use of the latter. Subsequent critical steps in this direction were taken by L. Kronecker

 61. Reverse Mathematics In Dependent Type Theory However, dependent type Theory has so far only been successfully applied to constructive mathematics a school of thought in the philosophy of mathematicshttp://gow.epsrc.ac.uk/ViewGrant.aspx?GrantRef=EP/D066638/1

62. OUP: UK General Catalogue
An introduction to the Theory of c*algegras in constructive mathematics , Hiroki Takamura. 18. Approximations to the numerical range of an element of a
http://www.oup.co.uk/isbn/0-19-856651-4
NEVER MISS AN OXFORD SALE (SIGN UP HERE) VIEW BASKET Quick Links About OUP Career Opportunities Contacts Need help? News oup.com Search the Catalogue Site Index American National Biography Booksellers' Information Service Children's Fiction and Poetry Children's Reference Dictionaries Dictionary of National Biography Digital Reference English Language Teaching Higher Education Textbooks Humanities International Education Unit Journals Law Medicine Music Online Products Oxford English Dictionary Reference Rights and Permissions Science School Books Social Sciences Very Short Introductions World's Classics Advanced Search UK and Europe Book Catalogue Help with online ordering How to order Postage Returns policy ... Table of Contents
##### From Sets and Types to Topology and Analysis Towards Practicable Foundations for Constructive Mathematics
Edited by Laura Crosilla and Peter Schuster
ISBN-13: 978-0-19-856651-9
Publication date: 6 October 2005
370 pages, 234x156 mm
Series: Oxford Logic Guides number 48
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63. Bas Spitters Articles
We use this Proof as a basis for a constructive Proof in the style of Bishop. In fact, the present Theory of compact groups may be seen as a natural
http://www.cs.ru.nl/~spitters/articles.html
 Bas Spitters' articles Constructive analysis, types and exact real numbers. (with Herman Geuvers Milad Niqui and Freek Wiedijk Constructive analysis, types and exact real numbers, special issue of Mathematical Structures in Computer Science (Bas Spitters, Herman Geuvers, Milad Niqui and Freek Wiedijk(eds.)) MSCS Volume 17, Issue 01, pp 3-36, 2007. doi:10.1017/S0960129506005834 pdf bib Abstract In the present paper, we will discuss various aspects of computable/constructive analysis, namely semantics, proofs and computations. We will present some of the problems and solutions of exact real arithmetic varying from concrete implementations, representation and algorithms to various models for real computation. We then put these models in a uniform framework using realisability, opening the door for the use of type theoretic and coalgebraic constructions both in computing and reasoning about these computations. We will indicate that it is often natural to use constructive logic to reason about these computations. Constructive Results on Operator Algebras Journal of Universal computation volume 11, issue 12

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