皆様
桔梗宏孝@神戸大学システム情報学研究科です.
2011年12月1日(木)の 17:00 から下記のように Lyon 1 大学の Amador Martin-Pizarro 氏による
モデル理論におけるMorleyの定理に関する神戸情報数理コロキウムの講演を予定しております.
講演者の Amador Martin-Pizarro 氏には,モデル理論の専門の方だけでなくロジック全般の
general audience 向けの講演になるよう,お願いしてあります.興味のある方は御参加ください.
なお,この回の次の神戸コロキウムでは,2011年12月12日 15:10 から Professor
Peter Vojtas (Charles Univ. (プラハ大学)) による many valued Prolog に
関する講演を予定しております.これについては改めてご案内いたします.
----------------------------------------------------------------------------------
神戸情報数理コロキウム
日時:2011年12月1日(木)17:00 〜 18:30
場所:神戸大学自然科学総合研究棟3号館4階421室(渕野グループ内プレゼンテーション室)
講演者: Amador Martin-Pizarro (リヨン1大学)
題目: Morley's theorem and Geometric Model Theory
アブストラクト:A countable theory is uncountably categorical if it only has a
unique model (up to isomorphism) on each
uncountable cardinal. Morley proved that a theory is uncountably
categorical if it is categorical on cardinality the continuum.
His proof uses the fact that every model can be built from basic
bricks, called strongly minimal sets (which generalise the
concept of an absolutely irreducible algebraic curve). The goal of
this talk is to give an overview (to a general audience) of
some of the ideas of the proof based on examples. Moreover, we will
link the classification of strongly minimal sets to results
in other areas of mathematics, specially number theory, such as the
existence of infinite Mersenne primes and Schanuel's
conjecture.
-------------------------------------------
神戸大学自然科学総合研究棟3号館への行き方:
http://kurt.scitec.kobe-u.ac.jp/~kikyo/seminar/scitec3.pdf
(重複して受け取られた場合はどうぞご容赦ください。)
京都大学の末永と申します。
来年1月に POPL 2012 と併設で開催される
PEPM 2012 のご案内をお送りいたします。
今回も日本からの4本の論文を含む
見所満載のプログラムになっております。
Early registration は12月24日までとなっております。
POPL ともども皆様の参加をお待ち申し上げております。
京都大学
末永幸平
ksuenaga(a)sato.kuis.kyoto-u.ac.jp
--
ACM SIGPLAN 2012 Workshop on Partial Evaluation and Program Manipulation
http://www.program-transformation.org/PEPM12
January 23-24, 2012. Philadelphia, PA, USA (co-located with POPL'12)
Call For Participation
Online registration is open at
https://regmaster3.com/2012conf/POPL12/register.php
Early registration deadline is December 24, 2011
The PEPM Symposium/Workshop series brings together researchers
and practitioners working in the broad area of program
transformation, which spans from refactoring, partial evaluation,
supercompilation, fusion and other metaprogramming to model-driven
development, program analyses including termination, inductive
programming, program generation and applications of machine learning
and probabilistic search. PEPM focuses on techniques, supporting
theory, tools, and applications of the analysis and manipulation of
programs.
In addition to the presentations of regular research papers, the PEPM
program includes tool demonstrations and `short paper' presentations
of exciting if not fully polished research.
PEPM has established a Best Paper award. The winner will be
announced at the workshop.
INVITED TALKS
Compiling Math to High Performance Code
Markus Pueschel (ETH Zuerich, Switzerland)
http://www.inf.ethz.ch/~markusp/index.html
Specification and verification of meta-programs
Martin Berger (University of Sussex, UK)
http://www.informatics.sussex.ac.uk/users/mfb21/
ACCEPTED PAPERS
Regular research papers:
Naoki Kobayashi, Kazutaka Matsuda and Ayumi Shinohara.
Functional Programs as Compressed Data
Kazutaka Matsuda, Kazuhiro Inaba and Keisuke Nakano.
Polynomial-Time Inverse Computation for Accumulative Functions with
Multiple Data Traversals
Dana N. Xu.
Hybrid Contract Checking via Symbolic Simplification
Susumu Katayama.
An Analytical Inductive Functional Programming System that Avoids
Unintended Programs
Roberto Giacobazzi, Neil Jones and Isabella Mastroeni.
Obfuscation by Partial Evaluation of Distorted Interpreters
Michael Gorbovitski, Yanhong A. Liu, Scott Stoller and Tom Rothamel.
Composing Transformations for Instrumentation and Optimization
Elvira Albert, Jesus Correas Fernandez, German Puebla and
Guillermo Roman-Diez.
Incremental Resource Usage Analysis
Takumi Goto and Isao Sasano.
An approach to completing variable names for implicitly typed
functional languages
Martin Hirzel and Bugra Gedik.
Streams that Compose using Macros that Oblige
Vlad Ureche, Tiark Rompf, Arvind Sujeeth, Hassan Chafi and Martin Odersky.
StagedSAC: A Case Study in Performance-Oriented DSL Development
Markus Degen, Peter Thiemann and Stefan Wehr.
The Interaction of Contracts and Laziness
Surinder Kumar Jain, Chenyi Zhang and Bernhard Scholz.
Translating Flowcharts to Non-Deterministic Languages
Francisco Javier Lopez-Fraguas, Enrique Martin-Martin and
Juan Rodriguez-Hortala.
Well-typed Narrowing with Extra Variables in Functional-Logic Programming
Geoff Hamilton and Neil Jones.
Superlinear Speedup by Distillation: A Semantic Basis
Short papers:
Jacques Carette and Aaron Stump.
Towards Typing for Small-Step Direct Reflection
Janis Voigtlaender.
Ideas for Connecting Inductive Program Synthesis and Bidirectionalization
Tool demonstration papers:
Edvard K. Karlsen, Einar W. Hoest and Bjarte M. Oestvold.
Finding and fixing Java naming bugs with the Lancelot Eclipse plugin
Adriaan Moors, Tiark Rompf, Philipp Haller and Martin Odersky.
Scala-Virtualized
Elvira Albert, Puri Arenas, Samir Genaim, Miguel Gomez-Zamalloa
and German Puebla.
COSTABS: A Cost and Termination Analyzer for ABS
各位
今年の12/1-2に高松でJSAI-IsAIの一部として開催される
法律と情報学のワークショップJURISIN2011
http://research.nii.ac.jp/~ksatoh/jurisin2011.html
のプログラムをお送り致します。多数の方のご参加をお待ちしております。
登録は、
http://www.ai-gakkai.or.jp/jsai-isai/2011/#registration
の情報をご覧ください。
12/1には法言語学(Forensic Linguistics)研究で有名な明治大学法学部の堀田秀吾教授
12/2にはIJCAIでResearch Excellence Awardを受賞したKowaski教授の招待講演があります。
どうぞよろしくお願いいたします。
佐藤 健
国立情報学研究所
===============================================================
JURISIN 2011 Program
Dec. 1, 2011
12:45-13:00 Opening Remark:
Ken Satoh (National Institute of Informatics and Sokendai)
13:00-14:00 Invited Talk I
Implications of Forensic Linguistics for Juris-informatics
Syugo Hotta (Meiji University)
14:00-14:30 Document Structure Analysis with Syntactic Model and
Parsers: Application to Legal Judgments
Hirokazu Igari, Akira Shimazu and Koichiro Ochimizu
14:30-15:00 Recall-Oriented Evaluation Metrics for Consistent
Translation of Japanese Legal Sentences
Yasuhiro Ogawa, Masaki Mori and Katsuhiko Toyama
15:00-15:30 Using Classification to Support Legal Knowledge Engineers
in the Eunomos Legal Document Management System
Luigi Di Caro, Llio Humphreys and Guido Boella
15:30-16:00 Coffee Break
16:00-16:30 Prerequisite-Effect Structure on Intuitionistic Kripke Model
Katsuhiko Sano, Shingo Hagiwara and Satoshi Tojo
16:30-17:00 The Concept and Definition of Software Accountability in
Legal Engineering
Ryo Hayasaka and Koichiro Ochimizu
Dec. 2, 2011
9:30-10:30 Invited Talk II
WUENIC: A Case Study in Rule-based Knowledge Representation
and Reasoning
Robert Kowalski(Imperial College London) and Anthony Burton
10:30-11:00 Coffee Break
11:00-11:30 A Substance-Field based Argumentation Framework
Wachara Fungwacharakorn, Nuanwan Soonthornphisaj
and Boonserm Kijsirikul
11:30-12:00 Deliberation Process Support System for Citizen Judge Trial
Based on Structure of Factors
Takanori Sato, Shogo Okada and Katsumi Nitta
12:00-12:30 A Semantics of Argumentation under Incomplete Information
Ken Satoh and Kazuko Takahashi
12:30-12:45 Concluding Remark:
Ken Satoh (National Institute of Informatics and Sokendai)
(重複して受け取られた場合はご容赦ください)
今年の12/1-3に高松で開催される LENLS8 国際ワークショップのプログラ
ムをお送り致します。多数の方のご参加をお待ちしております。
12/3にはアムステルダム大学のFrank Veltman先生、青山学院大学のEric
McCready先生によるチュートリアル講演を予定しています。
戸次大介(お茶の水女子大学)
照会先:lenls8 [[at]] easychair.org
[Apologies for multiple copies]
=================================================================
CALL FOR PARTICIPATION
Logic and Engineering of
Natural Language Semantics 8 (LENLS8)
Workshop Site : "Sunport Hall Takamatsu",
Takamatsu 2-1, Sunport, Takamatsu-shi, Kagawa-ken, Japan
Information/Registration: 5th Floor
Conference Rooms: 5th and 6th Floor
Dates : December 1-3, 2011
Contact Person: Alastair Butler
Contact Email : lenls8(a)easychair.org
Website : http://www.is.ocha.ac.jp/‾bekki/lenls/
=================================================================
Chair: Alastair Butler (JST/Tohoku University)
Invited Speaker(s):
Frank Veltman (University of Amsterdam)
Kentaro Inui (Tohoku University)
Information on Takamatsu:
http://www.takamatsu.or.jp/eng/http://www.city.takamatsu.kagawa.jp/english/access/http://www.my-kagawa.jp/eg/
LENLS is an annual international workshop focusing on formal semantics
and pragmatics. It will be held as one of the workshops of JSAI isAI 2011,
sponsored by The Japan Society for Artificial Intelligence (JSAI).
Registration
============
The proceedings of the workshop will be available at the
conference site for registered persons. Please follow the link
below and register yourself until 24th November 2011.
http://www.ai-gakkai.or.jp/jsai-isai/2011/index.html#registration
Program
=======
December 1st (Thu), 2011
-------------------------
09:00-10:00: Reception
10:00-10:10: Opening Remarks
10:10-11:40: Session 1
* Yoshiki Mori
"Back To the Future, Back From the Future
- To and Fro For the Counterfactual Future In the Past -"
* Yurie Hara, Yuli Feng and Shigeto Kawahara
"Emphatic Stress as Epistemic Conflict: A case study of Mandarin Chinese"
* Chungmin Lee
"Dynamic Perspective Shifts in Evidentials: Evidence from Korean"
11:40-13:00: Lunch
13:00-15:00: Session 2
* Mauricio Hernandes
"Players who don't know how to play.
An Haskell implementation of unawareness."
* Oleg Prosorov
"A Sheaf-Theoretic Framework for Dynamic Semantics"
* Margot Colinet and Gre'goire Winterstein
"Linking probabilistic accounts: polarity items and discourse markers"
* Hiroko Ozaki and Daisuke Bekki
"Extractability as Deduction Theorem in Subdirectional Combinatory Logic"
15:00-15:30: Coffee break
15:30-16:30: Session 3
* Gre'goire Winterstein
"Ludics and Presupposition Projection"
* Nicholas Asher and Jason Quinley
"Begging Questions, Getting Answers and Basic Cooperativity"
16:30-17:30: Invited Talk 1
* Frank Veltman (University of Amsterdam)
"(TBA)"
December 2nd (Fri), 2011
-------------------------
08:30-09:00: Reception
09:00-10:30: Session 4
* Yo Sato and Wai Lok Tam
"Underspecified types and the semantic bootstrapping of common nouns
and adjectives: a simulation with a robot's sensory data "
* David Yoshikazu Oshima
"The Japanese particle yo in declaratives:
Relevance, priority, and blaming"
* Katsuhiko Yabushita
"Japanese NPI Dare-mo as Unrestricted Universal Quantifier"
10:30-11:00: Coffee break
11:00-12:00: Session 5
* J.-R. Hayashishita and Daisuke Bekki
"Conjoined nominal expressions in Japanese: Interpretation through monad"
* Christina Unger
"Dynamic semantics as monadic computation"
12:00-13:30: Lunch
13:30-15:00: Session 6
* Satoru Suzuki
"Measurement-Theoretic Foundations of Gradable-Predicate Logic"
* Tzu-Keng Fu
"Universal Logic and the Logical Many-valuedness"
* Alastar Butler and Kei Yoshimoto
"Towards a self-selective and self-healing evaluation"
15:00-15:30: Coffee break
15:30-16:30: Invited Talk 2
* Kentaro Inui (Tohoku University)
"Toward Deep Processing of Language in the Era of Large-scale
Knowledge Resources: Time for Formal Semantics to Meet NLP Again"
Alternates
----------
* Eric Mccready
"Trust in Evidential Testimony"
December 3rd (Sat), 2011
-------------------------
On the 3rd December, there will also be special tutorial lectures
at the workshop venue by Frank Veltman (University of Amsterdam)
and Eric McCready (Aoyama Gakuin University).
Lecturer:
- Frank Veltman (University of Amsterdam)
- Eric McCready (Aoyama Gakuin University)
Location:
"Sunport Hall Takamatsu",
Takamatsu 2-1, Sunport, Takamatsu-shi, Kagawa-ken, Japan
Time Table (Tentative):
10:00-12:00 Session 1: Tutorial Lecture by Eric McCready
Title: (TBA)
12:00-13:30 Lunch
13:30-17:30 Session 2: Tutorial Lecture by Frank Veltman
Title: "Or else, what?"
Abstract: In this talk I will present the theory of imperatives
that I have developed in the past five years and apply it to a
number of problems involving disjunction. In particular I will
use it to analyse pseudo-imperatives and a variant of the Miners
Paradox.
Organizing Committee
====================
Alastair Butler (Chair)
Daisuke Bekki
Eric McCready
Yoshiki Mori
Yasuo Nakayama
Katsuhiko Yabushita
Tomoyuki Yamada
Shunsuke Yatabe
Kei Yoshimoto
Contact
=======
lenls8 [[at]] easychair.org
(Apologies for multiple copies)
Call for papers
*** Non-classical Modal and Predicate Logics ***
special issue of Logic Journal of IGPL
Modalities and predicates have since ancient time been central
notions in logic. In the 20th century, various systems of
non-classical logics have emerged, with applications in many
disciplines like Computer Science, Linguistics, Mathematics,
and Philosophy. This gave rise to the questions of non-classical
treatment of quantification and modalities and their accommodation
in these non-classical settings. In response, various modal and
predicate variants of non-classical logics have been introduced
and studied in the past decades.
This special issue is solely dedicated to modal and predicate
non-classical logics. Its aim is to bring together papers from
various branches of non-classical logics, not only to present
recent advances in the particular fields, but also to identify
common problems and methods and foster the exchange of ideas
between researchers from separate fields.
Topics of interest:
* The study of first- or higher-order variants of non-classical
logics, including, but not limited to:
- Predicate intuitionistic and superintuitionistic logics
- Predicate modal logics
- Predicate substructural logics
- Predicate many-valued and partial logics
- Predicate paraconsistent logics
- Predicate non-monotonic logics, etc.
* Non-classical theories of quantification over classical logic,
such as:
- Free logics
- Branching quantifiers and IF-logic
- Generalized quantifiers
* Extensions by modalities of (propositional or predicate)
non-classical logics, including:
- Modal extensions of (super)intuitionistic, substructural,
many-valued, paraconsistent, non-monotonic, etc., logics
- Co-algebraic treatment of modalities
We encourage to submit papers on the above logics from any
branches of mathematical logic (proof-theory, model theory,
game theory, complexity, etc.), be it purely theoretical or
about applications in the foundation of mathematics, computer
science, linguistics, and philosophy.
== Deadline ==
31 March 2012
== Submissions ==
Papers should be submitted to ncmpl(a)cs.cas.cz. Please also
use this email to express interest in submitting a paper.
== A related conference ==
This special issue is related with the conference Non-classical
Modal and Predicate Logics, organized Guangzhou (Canton), China,
5-9 December, 2011. http://logic.sysu.edu.cn/ncmpl2011
Petr Cintula, Rosalie Iemhoff, Shier Ju
guest editors
NIIレクチャーシリーズのお知らせ
国立情報学研究所(NII)では、海外の情報学に関係する著名研究者を招聘し、レクチャーシリーズを行っております。
今回は、論理学によるマルチエージェントシステム、ゲーム理論の定式化を研究されているノルウェーのベルゲン大学のThomas Agostnes先生の連続レクチャーのお知らせです。
講師:Professor Thomas Agotnes from University of Bergen, Norway.
講義名 :Social Laws for Multi-Agent Systems: Logic and Games
詳しい講演の内容は、 http://www.nii.ac.jp/en/calendar/2011/121302/
をご覧ください。
場所:国立情報学研究所 20階 2001 または2010室
講義日:2011年 12/13, 20, 27, 2012年1/10, 17, 24, 31
時間: 15:30-17:00
出席は無料で、どなたでも参加できます。
なお、CTL(computational tree logic)に興味をお持ちの方に対しては、本講義の中にこの論理の紹介およびマルチエージェントへの応用などが含まれており特に有用であると思います。
また、この連続講演の一部は、Ali Mili先生のソフトウェア工学関連の連続講演(http://www.nii.ac.jp/en/calendar/2011/1213/)
の後に行われるので、1日で2つの講演を連続して聞くことができます。
参加のご検討よろしくお願いします。
佐藤 健
国立情報学研究所および総研大
==========
- Lecture Series:
Social Laws for Multi-Agent Systems: Logic and Games
Lecturer:
Professor Thomas Agotnes, University of Bergen
Thomas Agotnes is a professor at the Department of Information Science and
Media Studies at the University of Bergen, Norway. Since his PhD in 2004
form University of Bergen, Agotnes has worked and published extensively in
multi-agent systems and related areas. In 2009, he won best paper award at
AAMAS 2009 on logical analysis of normative systems. Agotnes is an active
member of the international multi-agent systems community. He is a member of
the board of directors of the European Association for Multi-Agent Systems
(EURAMAS), was the general chair of STAIRS 2010, and has served on the
program committees of the main conferences and workshops in his field,
including the senior program committees of AAMAS and IJCAI.
Schdeule
Lecture 1: Specifying and verifying state-transition models for multi-agent
Systems
Place: National Institute of Informatics, Lecture room 2001, 20F
Date: 15:30-17:00, December 13, 2011
Lecture 2: Social laws for coordination
Place: National Institute of Informatics, Lecture room 2001, 20F
Date: 15:30-17:00, December 20, 2011
Lecture 3: Dealing with non-compliance
Place: National Institute of Informatics, Lecture room 2001, 20F
Date: 15:30-17:00, December 27, 2011
Lecture 4: Coordinating self-interested agents
Place: National Institute of Informatics, Lecture room 2001, 20F
Date: 15:30-17:00, January 10, 2012
Lecture 5: Social laws design as an optimisation problem, and as a mechanism
design problem
Place: National Institute of Informatics, Lecture room 2010, 20F
Date: 15:30-17:00, January 17, 2012
Lecture 6: Reasoning about social laws
Place: National Institute of Informatics, Lecture room 2010, 20F
Date: 15:30-17:00, January 24, 2012
Lecture 7: Strategic reasoning under imperfect information
Place: National Institute of Informatics, Lecture room 2010, 20F
Date: 15:30-17:00, January 31, 2012
Sixth NII Type Theory Workshop
Date: November 14, 2011, 11:00--17:00
Place: National Institute of Informatics, Room 2005 (20th floor)
場所: 国立情報学研究所 20階 2005室
(半蔵門線,都営地下鉄三田線・新宿線 神保町駅または東西線 竹橋駅より徒歩5分)
(地図 http://www.nii.ac.jp/introduce/access1-j.shtml)
Program:
11:00--11:30 Takayuki Koai (National Institute of Informatics)
Title: Verification of Substitution Theorem Using HOL
11:30--12:00 Mauricio Hernandes (The Graduate University for Advanced Studies)
Title: Game theory from a logician perspective
12:00--13:40 Lunch Break
13:40--14:10 Takanori Hida (Kyoto University)
Title: A computational interpretation of the axiom of determinacy
14:10--14:40 Makoto Tatsuta (National Institute of Informatics)
Title: Non-Commutative Infinitary Peano Arithmetic
14:40--15:00 Tea Break
15:00--16:00 Neil D. Jones (University of Copenhagen)
Title: Termination Analysis of the Untyped lambda-Calculus
16:00--17:00 Stefano Berardi (Torino University)
Title: A Topology over a set of Knowledge States and a Fixed Point Problem
Abstracts:
----------------------------------------------------------------------
Takayuki Koai (National Institute of Informatics)
Title: Verification of Substitution Theorem Using HOL
Abstract: Substitution Theorem is a new theorem in untyped lambda
calculus, which was proved in 2006. This theorem states that for a
given lambda term and given free variables in it, the term becomes
weakly normalizing when we substitute arbitrary weakly normalizing
terms for these free variables, if the term becomes weakly normalizing
when we substitute a single arbitrary weakly normalizing term for
these free variables. This paper formalizes and verifies this theorem
by using higher-order theorem prover HOL. A control path, which is
the key notion in the proof, explicitly uses names of bound variables
in lambda terms, and it is defined only for lambda terms without bound
variables renaming. The lambda terms without bound variable renaming
are formalized by using the HOL package based on contextual
alpha-equivalence. The verification uses 10119 lines of HOL code and
326 lemmas. This is a joint work with Makoto Tatsuta.
----------------------------------------------------------------------
Mauricio Hernandes (The Graduate University for Advanced Studies)
Title: Game theory from a logician perspective
Abstract: I intend in this talk to introduce a few concepts in game
theory like Nash Equilibrium and Backward-Induction, and then express
those ideas with some modal logic.
----------------------------------------------------------------------
Takanori Hida (Kyoto University)
Title: A computational interpretation of the axiom of determinacy
Abstract: Axiom of determinacy(AD) is a central topic in descriptive
set theory and there are a number of research on this axiom. In this
talk, we approach to the computational content of negative translation
of AD using realizability interpretation due to Berardi, Bezem and
Coquand (1998).
----------------------------------------------------------------------
Makoto Tatsuta (National Institute of Informatics)
Title: Non-Commutative Infinitary Peano Arithmetic
Abstract: Does there exist any sequent calculus such that it is a
subclassical logic and it becomes classical logic when the exchange
rules are added? The first contribution of this paper is answering
this question for infinitary Peano arithmetic. This paper defines
infinitary Peano arithmetic with non-commutative sequents, called
non-commutative infinitary Peano arithmetic, so that the system
becomes equivalent to Peano arithmetic with the omega-rule if the the
exchange rule is added to this system. This system is unique among
other non-commutative systems, since all the logical connectives have
standard meaning and specifically the commutativity for conjunction
and disjunction is derivable. This paper shows that the provability
in non-commutative infinitary Peano arithmetic is equivalent to
Heyting arithmetic with the recursive omega rule and the law of
excluded middle for Sigma-0-1 formulas. Thus, non-commutative
infinitary Peano arithmetic is shown to be a subclassical logic. The
cut elimination theorem in this system is also proved. The second
contribution of this paper is introducing infinitary Peano arithmetic
having antecedent-grouping and no right exchange rules. The first
contribution of this paper is achieved through this system. This
system is obtained from the positive fragment of infinitary Peano
arithmetic without the exchange rules by extending it from a positive
fragment to a full system, preserving its 1-backtracking game
semantics. This paper shows that this system is equivalent to both
non-commutative infinitary Peano arithmetic, and Heyting arithmetic
with the recursive omega rule and the Sigma-0-1 excluded middle. This
is a joint work with Stefano Berardi and was presented at CSL 2011.
----------------------------------------------------------------------
Neil D. Jones (University of Copenhagen)
Title: Termination Analysis of the Untyped lambda-Calculus
Abstract: An algorithm is developed that, given an untyped
lambda-expression, can certify that its call-by-value evaluation will
terminate. It works by an extension of the ``size-change principle''
earlier applied to first-order programs. The algorithm is sound (and
proven so) but not complete: some lambda-expressions may in fact
terminate under call-by- value evaluation, but not be recognised as
terminating. The intensional power of size-change termination is
reasonably high: It certifies as terminating all primitive recursive
programs, and many interesting and useful general recursive algorithms
including programs with mutual recursion and parameter exchanges, and
Colson's ``minimum'' algorithm. Further, the approach allows free use
of the Y combinator, and so can identify as terminating a substantial
subset of PCF. (joint work with Nina Bohr; in Logical Methods in
Computer Science, 2008, Issue 1)
----------------------------------------------------------------------
Stefano Berardi (Torino University)
Title: A Topology over a set of Knowledge States and a Fixed Point Problem
Abstract: We give an abstract formulation of the termination problem
for realizer of Heyting Arithmetic plus various subsystem of classical
logic. This termination problem is expressed as the existence of a
fixed point for a class of continuous maps in a suitable topology.
----------------------------------------------------------------------