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PRNCL 2009 - Workshop on Proofs and Refutations in Non-Classical Logics (affiliated with Tableaux 2009) Call for Papers July 6, 2009, Oslo, Norway http://www.loria.fr/~galmiche/PRNCL09.html * There are various ways to design a refutation-based deduction system. Deduction systems where refutations completely replace proofs as first-class citizens, with a set of rules inductively defining refutation trees; systems combining proof-rules and refutation mechanisms (or criteria) which can occur at various levels of the proof-search process; systems where provability and refutability play dual roles, i.e., proofs and refutations are both first-class citizens; systems where refutations are understood as mechanisms that build counter-models: for example, semantic information is collected and may converge to a counter-model as the search process evolves. Such approaches are applicable to a wide range of logics like sub-structural logics, intermediate logics and their extensions, modal or temporal logics, even to type theory. The deduction systems can be based on various structures/methods: sequents, tableaux, natural deduction, connections, proof-nets, games, etc. The aim of the workshop is to provide a forum of discussion between researchers interested in non-classical logics in the perspective of proof and refutation systems. * Detailed information about topics and submission can be found on the web page. * Program Committee : R. Dyckhoff (Univ. St Andrews, Scotland); C. Fermueller (T.U. Wien, Austria); D. Galmiche (LORIA - UHP, France); D. Larchey-Wendling (LORIA - CNRS, France); F. Pfenning (CMU Pittsburgh, USA); A. Waaler (Univ. Oslo, Norway) * Important dates: extended abstract submission: May 15, 2009; Notification: June 2, 2009.