- Information
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LOGICA 2009
22 – 26 June, 2009The 23th in the series of annual international symposia devoted to logic, was held at Hejnice, 22 – 26 June 2009.
The invited speakers of the conference wereJC Beall, Nuel Belnap, and Stephen Read
Selected contributions to the conference were published in Michal Peliš (ed.):
The Logica Yearbook 2009The conference was sponsored by Bernard Family Brewery Humpolec 
- Program
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L o g i c a 2 0 0 9 - Programme
Tuesday, 23 June
>> morning sessionNuel Belnap Truth, Neither-True-Nor-False,
and SupervaluationsTomasz Placek
On Attempting
Roberto Ciuni Stit Logic and Metric Possible Choices Christian Fermüller Some Critical Remarks on Incompatibility Semantics Petr Hájek Ontological Proofs of Existence and Non-Existence
>> afternoon sessionCatarina Dutilh Novaes
Surprises in Logic Yaroslav Shramko
and Heinrich WansingThe Slingshot Argument and Sentential Identity Doroteya Angelova Logical and Epistemological Significance
of the Inconsistent and Incomplete Worlds
and Their ApplicationsFrancesco Berto Impossible Worlds and Propositions:
A Case against the Parity ThesisJulien Murzi Carnap’s Categoricity Problem and the Meanings of the Logical Constants Ole Hjortland Categoricity and Non-Classical Logics
Wednesday, 24 June
>> morning sessionStephen Read
Field's Paradox and its Medieval Solution John Kearns What is Natural about Natural Deduction
Annika Kanckos Gentzen’s Consistency Proofs for Arithmetic Shawn Standefer Philosophical Aspects of Display Logic Lionel Shapiro Deflating Logical Consequence
>> afternoon session
Greg Restall Always More Bjørn Jespersen Modification and Pseudo-Detachment:
From (AB)a Infer A*aSebastian
Sequoiah-GraysonAjdukiewicz Functions and Basic Inference Katarzyna
Kijania-PlacekDescriptive Indexicals and the Referential/Attributive Distinction Vítězslav Švejdar Decision Problems of some Intermediate Logics and Their Fragments Curtis Franks Reasoning about Meta-Theory in Weak Theories Presentation of the project "Organon"
Thursday, 25 June
>> morning sessionJc Beall Truth, Necessity, and Abnormal Worlds Juraj Podroužek
and Igor SedlárA New Notion of Relevance and the Logic
of Simple ProcessesOndrej Majer and
Michal PelišLogic of Questions from the Viewpoint
of Dynamic Epistemic LogicHans Lycke Generalized Conversational Relevance: Relevance Conditions for Asserting Disjunction
Friday, 26 June
>> morning sessionMartin Pleitz The Liar Meets McTaggart:
Paradox and the Indexical FallacyMarie Duží Tenses and Truth-conditions:
A Plea for If-Then-ElseChristoph Roschger Evaluation Games for Shapiro's Logic of Vagueness in Context Barry Hartley Slater Ontological Discriminations Andreas Pietz Logics and Stories
