July 2017 - Categories - categories.org.au

Models of finite-limit sketches in internal logic of a (pre)topos
by David Roberts 13 Jul '17

13 Jul '17

Hi all, I believe that if one has some finite limit sketch S, then models of S in the internal logic of a topos E should be equivalent to external models. I'm thinking here about forcing from the sheaf-theoretic viewpoint, so that some algebraic gizmo in the forced model(=in internal logic of the topos) is none other than that algebraic gizmo internal to the category from the external perspective. Or, that a model in some filterquotient E/~ of a topos E is equivalent to a model in E. Is there a reference I could point to? Or is it obvious because a finite-limit sketch uses no quantifiers etc? I would guess such reasoning to hold in a much more general setting than a topos, for instance pretoposes or regular categories. A second question, that I do not know the answer to: how far can one generalise theories (from finite-limit etc) and still get {models in internal logic} ~ {models in the category}? Here "the category" has sufficient structure to interpret the theory. Thanks, David -- David Roberts http://ncatlab.org/nlab/show/David+Roberts [For admin and other information see: http://www.mta.ca/~cat-dist/ ]

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CT2017-Program now available
by John MacDonald 13 Jul '17

13 Jul '17

FIFTH and FINAL ANNOUNCEMENT CT2017: INTERNATIONAL CONFERENCE ON CATEGORY THEORY AND ITS APPLICATIONS July 16-22, 2017 University of British Columbia Vancouver, Canada Dear Colleagues, The CT2017 program of talks and social events is now available on the following two websites http://www.pims.math.ca/scientific-event/170716-c2ictc http://www.mat.uc.pt/~ct2017 Invited Speakers D. Hofmann, R. Lucyshyn-Wright M. Menni R. Pare T. Van der Linden In an event related to CT2017, a set of expository talks will be presented in the Kan Extension Seminar on Monday afternoon July 17. Scientific Committee M. M. Clementino M. Gran G. Janelidze(Chair) P. T. Johnstone J. L. MacDonald S. Mantovani R. H. Street W. P. Tholen Organizing Committee M. Christiansen(Chair) J. L. MacDonald J. Picado We look forward to welcoming all the registered participants to the University of British Columbia in Vancouver, Canada. We have an excellent program of talks and social events lined up in a beautiful location! This is the 20th anniversary of the first Vancouver CT meeting. Earlier meetings were held here in 1997, 2004 and 2011. Regards, Lauchie MacDonald [For admin and other information see: http://www.mta.ca/~cat-dist/ ]

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APCS: special volume in honour of Robert Lowen
by Maria Manuel Clementino 13 Jul '17

13 Jul '17

SPECIAL VOLUME IN HONOUR OF ROBERT LOWEN ON THE OCCASION OF HIS SEVENTIETH BIRTHDAY Robert Lowen will celebrate his 70th birthday this October. "Applied Categorical Structures", the journal of which he is the Founding Editor, will dedicate a special volume to him at this occasion. Authors are invited to submit their manuscripts in electronic form to Maria Manuel Clementino <mmc(a)mat.uc.pt>, possibly suggesting one of the Guest Editors to be assigned to the paper. All papers will be carefully refereed following the standards of "Applied Categorical Structures". The deadline for submission of papers is 30 November 2017. The Guest Editors Bernhard Banaschewski, Maria Manuel Clementino, Eva Colebunders, George Janelidze, Ross Street, Walter Tholen [For admin and other information see: http://www.mta.ca/~cat-dist/ ]

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Workshop Brussels August 29-30, 2017
by Joost Vercruysse 12 Jul '17

12 Jul '17

Dear Colleagues, We would like to invite you to the “Brussels Hopf algebra workshop 2017”, which is held on August 29-30 at the “Université Libre de Bruxelles”. Topics are Hopf algebras, monoidal categories and quantum groups. Confirmed speakers include Thomas Timmermann and Ignacio Lopez Franco. The deadline for registration is 15 August 2017. There is a limited number of slots available for talks and participants are encouraged to give a talk. Speakers who need support are invited to contact us as soon as possible, since our resources are limitted. All information, as well as the registration form can be found at http://homepages.ulb.ac.be/~hopfalgb/hopfworkshop/ Questions or requests for support can be send to hopfalgebras2017(a)gmail.com We hope to see you soon in Brussels, Mitchell Buckley, Timmy Fieremans, Christina Vasilakopoulou, Joost Vercruysse [For admin and other information see: http://www.mta.ca/~cat-dist/ ]

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AiML 2018: FIRST CALL FOR PAPERS
by Thomas Studer 03 Jul '17

03 Jul '17

[ Please distribute, apologies for multiple postings. ] AiML 2018: FIRST CALL FOR PAPERS 12TH INTERNATIONAL CONFERENCE ON ADVANCES IN MODAL LOGIC BERN, 27 AUGUST -- 31 AUGUST 2018 http://www.aiml2018.unibe.ch Advances in Modal Logic is an initiative aimed at presenting the state of the art in modal logic and its various applications. The initiative consists of a conference series together with volumes based on the conferences. Information about the AiML series can be obtained at http://www.aiml.net AiML 2018 is the 12th conference in the series. AiML 2018 will be co-located with the sixth edition of the conference "Logic, Algebra and Truth Degrees" (LATD 2018) http://www.latd2018.unibe.ch/. TOPICS We invite submissions on all aspects of modal logic, including: - history of modal logic - philosophy of modal logic - applications of modal logic - computational aspects of modal logic (complexity and decidability of modal and temporal logics, modal and temporal logic programming, model checking, model generation, theorem proving for modal logics) - theoretical aspects of modal logic (topological/algebraic/categorical perspectives on modal logic, coalgebraic modal logic, completeness and canonicity, correspondence and duality theory, many-dimensional modal logics, modal fixed point logics, model theory of modal logic, proof theory of modal logic) - specific instances and variations of modal logic (description logics, modal logics over non-boolean bases, dynamic logics and other process logics, epistemic and deontic logics, modal logics for agent-based systems, modal logic and game theory, modal logic and grammar formalisms, provability and interpretability logics, spatial and temporal logics, hybrid logic, intuitionistic logic, substructural logics, computationally light fragments of all such logics) Papers on related subjects will also be considered. PAPER SUBMISSIONS There will be two types of submissions for AiML 2018: (1) Full papers for publication in the proceedings and presentation at the conference. (2) Short presentations intended for presentation at the conference but not for the published proceedings. Both types of papers should be submitted electronically using the EasyChair submission page at https://easychair.org/conferences/?conf=aiml2018 At least one author of each accepted paper or short presentation must register for and attend the conference. (1) FULL PAPERS Authors are invited to submit, for presentation at the conference and publication in the proceedings, full papers reporting on original research and not submitted elsewhere. The proceedings of AiML 2018 will be published by College Publications http://www.collegepublications.co.uk in a volume to be made available at the conference. The submissions should be at most 15 pages, with an optional technical appendix of up to 5 pages, together with a plain-text abstract of 100-200 words. The submissions must be typeset in LaTeX, using the style files and template that will be provided on the AiML 2018 website http://www.aiml2018.unibe.ch in due time. Authors must submit an abstract in plain text via EasyChair by the abstract deadline prior to full submission of their paper. The presentations of accepted full papers will be 30 minutes long. (2) SHORT PRESENTATIONS. These should be at most 5 pages. They may describe preliminary results, work in progress etc., and will be subject to light reviewing. The accepted submissions will be made available at the conference, and the authors will have the opportunity to give short presentations (of up to 15 minutes) on them. INVITED SPEAKERS Agata Ciabattoni (TU Wien, Austria) Rob Goldblatt (Victoria University, New Zealand) Rosalie Iemhoff (Utrecht University, The Netherlands) -- joint AiML-LATD invited speaker Stanislav Kikot (Birkbeck College London and Institute for Information Transmission Problems, Moscow) Dana Scott (University of California, Berkeley) LOCAL ORGANIZING COMMITTEE Bettina Choffat Almudena Colacito José Gil-Ferez Eveline Lehmann George Metcalfe (chair) Nenad Savić Silvia Steila Thomas Studer (chair) PROGRAMME COMMITTEE Natasha Alechina (University of Nottingham) Lev Beklemishev (Steklov Mathematical Institute of Russian Academy of Sciences in Moscow) Guram Bezhanishvili (New Mexico State University) Marta Bílková (Charles University) Patrick Blackburn (University of Roskilde) Giovanna D'Agostino (University of Udine) Stéphane Demri (CNRS, LSV, ENS Paris-Saclay) David Fernández-Duque (Institute de Recherche en Informatique de Toulouse) David Gabelaia (TSU Razmadze Mathematical Institute) Mai Gehrke (CNRS Paris Diderot) Silvio Ghilardi (Università degli Studi di Milano) Nina Gierasimczuk (Danish Technical University) Valentin Goranko (Stockholm University) Rajeev Goré (The Australian National University) Helle Hvid Hansen (Delft University of Technology) Ian Hodkinson (Imperial College) Wesley Holliday (UC Berkeley) Emil Jeřábek (Czech Academy of Sciences) Marcus Kracht (Bielefeld University) Clemens Kupke (University of Strathclyde) Agi Kurucz (King's College London) Roman Kuznets (TU Wien) Tamar Lando (Columbia University) Carsten Lutz (Universität Bremen) Larry Moss (Indiana University) Sara Negri (University of Helsinki) Eric Pacuit (University of Maryland) Valeria de Paiva (Nuance Communications, USA) Mark Reynolds (The University of Western Australia) Ilya Shapirovsky (Institute for the Information Transmission Problems) Valentin Shehtman (Institute for the Information Transmission Problems) Sonja Smets (Institute of Logic, Language and Computation) Viorica Sofronie-Stokkermans (Universität Koblenz-Landau) Thomas Studer (Universität Bern) Heinrich Wansing (Ruhr University Bochum) Frank Wolter (University of Liverpool) Michael Zakharyaschev (Birkbeck College London) PROGRAMME COMMITTEE CHAIRS Guram Bezhanishvili (New Mexico State University) Giovanna D'Agostino (University of Udine) IMPORTANT DATES Abstracts of full papers submission deadline: 11 March 2018 Full papers submission deadline: 18 March 2018 Full papers acceptance notification: 18 May 2018 Short presentations submission deadline: 20 May 2018 Short presentations acceptance notification: 8 June 2018 Final version of full papers and short presentations due: 17 June 2018 Conference: 27 August -- 31 August 2018 FURTHER INFORMATION Please see http://www.aiml2018.unibe.ch ENQUIRIES E-mail enquiries should be directed to the PC chairs, sent to aiml2018(a)easychair.org [For admin and other information see: http://www.mta.ca/~cat-dist/ ]

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