みなさま,
LORIA-CNRSのHans van Ditmarsch教授により,以下の講演を行います.
どうぞふるってご参加ください.
日時:9/13(金)15:00--17:00
場所:北陸先端科学技術大学院大学 情報 II 棟コラボ6
東条
*********
One Hundred Prisoners and a Light Bulb
Consider this riddle:
"A group of 100 prisoners, all together in the prison dining area, are
told that they will be all put in isolation cells and then will be
interrogated one by one in a room containing a light with an on/off
switch. The prisoners may communicate with one another by toggling the
light-switch (and that is the only way in which they can communicate).
The light is initially switched off. There is no fixed order of
interrogation, or interval between interrogations, and the same
prisoner will be interrogated again at any stage. When interrogated, a
prisoner can either do nothing, or toggle the light-switch, or
announce that all prisoners have been interrogated. If that
announcement is true, the prisoners will (all) be set free, but if it
is false, they will all be executed. While still in the dining room,
and before the prisoners go to their isolation cells (forever), can
the prisoners agree on a protocol that will set them free?"
In this presentation I will present a solution, however I will mainly
address such puzzles of knowledge in general. There are many others,
such as the ‘Muddy Children Puzzle’ (also known as the ‘Wisemen
Puzzle’), ‘Surprise Examination’, ‘Monty Hall’, etc. They often
involve a (seemingly) paradoxical aspect making agents knowledgeable
by announcements of their ignorance. Their provenance and
dissemination is intriguing. Haruyuki Kawabe kindly told me that in
Japan, a version of the Muddy Children Puzzle with coloured hats is
known as 'Dirac's Puzzle', after the physicist Paul Dirac who
introduced some Japanese physicists to the riddle about 1938, and it
seems one of them wrote a novel using the idea of the puzzle in 1940.
There is a relation between such knowledge puzzles and the area in
logic known as ‘dynamic epistemic logic’. More information on such
puzzles is found in the book also entitled 'One Hundred Prisoners and
a Light Bulb' (Copernicus, 2015) and on the webpage
http://personal.us.es/hvd/lightbulb.html. The puzzlebook has been
translated into Japanese by Haruyuki Kawabe.
Hans van Ditmarsch is a senior researcher at CNRS (the French National
Research Organization), and based at LORIA in Nancy, where he is
heading the research team CELLO (Computational Epistemic Logic in
Lorraine). He is also affiliated to IMSc (Institute for Mathematical
Sciences), in Chennai. His research is on the dynamics of knowledge
and belief, information-based security protocols, modal logics, and
combinatorics. He has been an editor of the Journal of Philosophical
Logic. He is an author of the book Dynamic Epistemic Logic, an editor
of the Handbook of Epistemic Logic.
*************
=====================================================
AWPL 2020: 5th Asian Workshop on Philosophical Logic
7-9 April 2020
Hangzhou, China
https://www.xixilogic.org/events/awpl2020/ <https://www.xixilogic.org/events/awpl2020/>
=====================================================
CALL FOR PAPERS
The 5th Asian Workshop on Philosophical Logic, 7-9 April 2020, Hangzhou, China
Asian Workshop on Philosophical Logic (AWPL) is an event-series initiated by a group of Asian logicians, and in 2012 the first installment took place at the JAIST in Japan. It is devoted to promote awareness, understanding, and collaborations among researchers in philosophical logic and related fields. The workshop emphasizes the interplay of philosophical ideas and formal theories. Topics of interest include non-classical logics, philosophical logics, algebraic logics, and their applications in computer science, cognitive science, and social sciences. The second, third and fourth workshops took place successfully in Guangzhou (2014), Taipei (2016) and Beijing (2018), respectively. The previous post conference proceedings were published in the Studia Logica book series “Logic in Asia” (http://www.springer.com/series/13080?detailsPage=titles <http://www.springer.com/series/13080?detailsPage=titles>) with Springer.
The Fifth Asian Workshop on Philosophical Logic (AWPL 2020) will be held in Hangzhou, China, on 7-9 April 2020, organized by the Institute of Logic and Cognition at Zhejiang University.
The AWPL 2020 workshop is an event in the Zhejiang Logic for AI Summit (ZjuLogAI 2020, https://www.xixilogic.org/zjulogai/ <https://www.xixilogic.org/zjulogai/>) which takes place on 6-10 April 2020. All AWPL participants are invited to attend other events as well.
------------------------
INVITED SPEAKERS
To be confirmed.
------------------------
SUBMISSION
All submissions should present original works not previously published. Submissions should be typeset in English, using the LNCS template (https://www.springer.com/gp/computer-science/lncs/conference-proceedings-gu… <https://www.springer.com/gp/computer-science/lncs/conference-proceedings-gu…>), be prepared as a PDF file with at most 12 pages (including reference list, appendixes, acknowledgements, etc.), and be sent to the workshop electronically via EasyChair (https://easychair.org/conferences/?conf=awpl2020 <https://easychair.org/conferences/?conf=awpl2020>) by the corresponding author on time. It is assumed that, once a submission is accepted, at least one of its authors will attend the workshop and present the accepted work. After the workshop, selected submissions will be invited to revise and submit to a post conference proceedings, to be published in the “Logic in Asia” series.
------------------------
IMPORTANT DATES
Submission deadline: 30 November 2019
Notification: 1 January 2020
Workshop: 7-9 April 2020
------------------------
PROGRAM COMMITTEE (to be confirmed)
Thomas Ågotnes, University of Bergen
Nick Bezhanishvili, University of Amsterdam
Sujata Ghosh, Indian Statistical Institute
Meiyun Guo, South-West University, China
Fengkui Ju, Beijing Normal University
Kok-Yong Lee, National Chung Cheng University
Beishui Liao, Zhejiang University (chair)
Hanti Lin, University of California Davis
Fenrong Liu, Tsinghua University
Hu Liu, Sun Yat-Sen University
Xinwen Liu, Chinese Academy of Social Sciences
Minghui Ma, Sun Yat-Sen University
Hiroakira Ono, JAIST, Japan
Eric Pacuit, University of Maryland
R Ramanujam, Institute of Mathematical Sciences, India
Olivier Roy, University of Bayreuth
Katsuhiko Sano, Hokkaido University
Yì N. Wáng, Zhejiang University (co-chair)
Chin-Mu Yang, Taiwan National University
Jiji Zhang, Lingnan University
Logic-mlの皆様、名古屋大学のGarrigueです。
Coq Workshop 2019の開催案内をお送りします。
ご参加をお待ちしております。
早期参加申し込み締切:2019-08-04
**********************************************************************
The Coq Workshop 2019: Call for Participation
Colocated with the 10th International Conference on
Interactive Theorem Proving (ITP 2019), Portland, OR, USA
**********************************************************************
We are pleased to invite you to participate in the Coq workshop 2019,
which will be held on September 8 2019, in Portland, OR, USA.
The Coq workshop is part of ITP 2019 (https://itp19.cecs.pdx.edu/).
Topic:
- The Coq workshop 2019 is the 10th Coq Workshop. The Coq Workshop
series (https://coq.inria.fr/coq-workshop/) brings together Coq
(https://coq.inria.fr/) users, developers, and contributors. While
conferences usually provide a venue for traditional research papers,
the Coq Workshop focuses on strengthening the Coq community and
providing a forum for discussing practical issues, including the
future of the Coq software and its associated ecosystem of libraries
and tools. Thus, the workshop will be organized around informal
presentations and discussions, supplemented with invited talks.
Program:
- Invited talk:
+ Nicolas Tabareau: Not a single proof assistant for all, but proof assistants for everyone
- Discussion session with the Coq development team
- Accepted talks:
+ Kazuhiko Sakaguchi. Validating Mathematical Structures
+ Akira Tanaka. A Gallina Subset for C Extraction of Non-structural Recursion
+ Christian Doczkal and Damien Pous. Graph Theory in Coq: Minors, Treewidth, and Isomorphisms
+ Bruno Bernardo, Raphaël Cauderlier, Basile Pesin, Zhenlei Hu and Julien Tesson.
Mi-Cho-Coq, a framework for certifying Tezos Smart Contracts
+ Reynald Affeldt, Jacques Garrigue, Xuanrui Qi and Kazunari Tanaka.
Experience Report: Type-Driven Development of Certified Tree Algorithms in Coq
+ Enrico Tassi and Erik Martin-Dorel. SSReflect in Coq 8.10
+ Matthieu Sozeau, Yannick Forster, Simon Boulier, Nicolas Tabareau and Théo Winterhalter.
Coq Coq Codet!
+ Florian Steinberg and Holger Thies.
Computable analysis, exact real arithmetic and analytic functions in Coq
+ Florian Steinberg. _Some formal proofs about summable sequences in Coq
- See https://staff.aist.go.jp/reynald.affeldt/coq2019/ for the schedule.
Registration:
- Early registration is before [2019-08-04 Sun]
- See the ITP 2019 website for registration information:
https://itp19.cecs.pdx.edu/registration/
Program Committee:
- Reynald Affeldt (AIST)
- Christian Doczkal (CNRS - LIP, ENS Lyon)
- Jacques Garrigue (Nagoya University)
- Chantal Keller (LRI, Univ. Paris-Sud)
- Dominique Larchey-Wendling (CNRS, Loria)
- Gregory Malecha (BedRock Systems Inc.)
- Pierre-Marie Pédrot (INRIA)
- Ilya Sergey (Yale-NUS College and NUS School of Computing)
- John Wiegley (DFINITY)
Organization contact (co-chairs):
reynald.affeldt AT aist.go.jp, garrigue AT math.nagoya-u.ac.jp
--
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皆様
Padova大学のFrancesco Ciraulo先生の講演のお知らせです。
どうぞふるってご参加ください。
河井 達治
北陸先端科学技術大学院大学 情報科学系
e-mail: tkawai(a)jaist.ac.jp
-----------------------------------------------
* JAIST Logic Seminar Series *
* The seminar below is held as a part of JSPS Core-to-Core Program,
A. Advanced Research Networks and EU Horizon 2020 Marie Skłodowska-Curie
actions RISE project CID
(http://www.jaist.ac.jp/logic/ja/core2core, http://cid.uni-trier.de/).
Date: Wednesday 31st July, 2019, 15:20-17:00
Place: JAIST, Collaboration room 6 (I-57g)
(https://www.jaist.ac.jp/english/top/access/index.html)
Speaker: Francesco Ciraulo (University of Padova)
Title:
Overlap algebras: a constructive alternative to complete Boolean algebras
Abstract:
Although (complete) Boolean algebras does exist in a constructive
framework, they fail to capture very basic examples, such as powersets.
Constructively, the subsets of a given set form a complete Heyting
algebra (locale), but one of a very special kind: it is an “overlap
algebra”. The definition of an overlap algebra, as proposed by Giovanni
Sambin some years ago, collapses to that of a complete Boolean algebra
(Boolean locale) if the Principle of Excluded Middle (PEM) holds.
Overlap algebras can be useful to obtain constructive versions of
classical results about complete Boolean algebras. For instance, the
regular open sets in a topological space form an overlap algebra. More
generally, the smallest strongly dense sublocale of an overt locale is
an overlap algebra. (The latter is a version of Isbell’s density theorem.)
The sublocales of an overlap algebra have not been completely understood
yet (contrary to the case of Boolean locales). At the moment we only
know that the open sublocales of a given overlap algebra L are overlap
algebras, and that there is a bijection between those sublocales of L
which are overlap algebras, on one side, and the overt weakly closed
sublocales of L (i.e. the points of its lower-powerlocale), on the other
side.
The internal locales in the topos of sheaves over a given locale L
correspond to morphisms with codomain L in the (external) category of
locales. In particular, internal overt locales correspond to open maps.
Since overlap algebras are a special class of overt locales, it should
be possible to identify internal overlap algebras in a localic topos as
a special class of open maps. The ultimate goal would be to exploit the
fact that a locale which is not an overlap algebra can “become” an
overlap algebra internally in many Grothendieck toposes.
みなさま
来週火曜日に京都大学にて吉田展子さん(Imperial College London)によるご講演があります。
詳細は下記の通りです(いつもとは曜日・時間が異なりますのでご注意ください)。
よろしければぜひご参加ください。
京都大学数理解析研究所
照井一成
==========
Time: 14:00-15:00, July 30th, Tuesday, 2019
Place: Rm 478, Research Building 2, Main Campus, Kyoto University
京都大学 本部構内 総合研究2号館 4階478号室
http://www.kyoto-u.ac.jp/en/access/yoshida/main.html (Building 34)
Title: Behavioural Type-based Static Verification Framework for Go
Speaker: Nobuko Yoshida (Imperial College London) http://mrg.doc.ic.ac.uk/
Abstract:
I first give an overview of recent researches of my group.
Go is a production-level statically typed programming language whose design
features
explicit message-passing primitives and lightweight threads, enabling (and
encouraging) programmers to develop concurrent systems where components
interact through communication more so than by lock-based shared memory
concurrency. Go can detect global deadlocks
at runtime, but does not provide any compile-time protection against all
too common communication mismatches and partial deadlocks.
In this work we present a static verification framework for liveness and
safety in Go programs, able to detect communication errors and deadlocks by
model checking. Our toolchain infers from a Go program a faithful
representation of its communication patterns
as behavioural types, where the types are model checked for liveness and
safety.