We are glad to announce the winners of the Louis Couturat Logic Prize for France 2025 https://www.uni-log.org/logic-prize-france-2025 ------------------------------------------------------------------------------------------------------------ Fabien Schang, Lycée Rosa Parks, Thionville, France & Evandro Luís Gomes, State University of Maringá, Brazil Title of the paper: Relative contradictoriness Abstract: Our thesis about contradictoriness is a threefold one: it is a *relative*, theory-dependent concept; it is a synonym of *absurdity*, which is a constant of falsity; it is to be used as a *definiens* of sentential negation and truth-values, contrary to its usual presentation. First of all, we review both the motivation of such a thesis and its philosophical consequences about the nature of negation and truth-values. Then we propose a formal background encompassing the relativity of contradictoriness into a set of increasingly complex question-answer games, explicating the variety of its formulations by a variety of available answers that make sense of truth-values. ------------------------------------------------------------------------------------------------------------------------------------------- We have here a joint paper. The rule for joint papers is that the first author has to currently live and work in the country where the paper is submitted for the prize. The project A PRIZE OF LOGIC IN EVERY COUNTRY! is in favor of international collaboration. And it is good to see here the victory of the collaboration between France and Brazil. ------------------------------------------------------------------------------------------------------------ The organizer of this 3rd edition of the Louis Couturat Prize was Ivan Varzinczak. Dziękuję bardzo Ivan! Ivan was not only the winner of the 1st edition of the Louis Couturat Prize but also of the 1st First World Logic Prizes Contest, which took place June 24, 2018, during the 6th UNILOG in Vichy, France, with an international jury of 7 members, Göran Sundholm being the president: https://www.uni-log.org/logic-prizes-2018 Here is a video with Ivan promoting the World Logic Prizes Contest: https://youtu.be/yotJZ4ZCYhg -------------------------------------------------------------------------------------------------- This paper will be published in the journal Logica Universalis and will represent France at the 3rd edition of the World Logic Prizes Contest which will take place during the 8th UNILOG in Cusco: https://sites.google.com/view/unilog2025/logic-prizes ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Prof. Dr. Dr. Jean-Yves Beziau Federal University of Rio de Janeiro, Brazil https://philpeople.org/profiles/jean-yves-beziau Creator of the Louis Couturat logic prize and Director of the project A PRIZE OF LOGIC IN EVERY COUNTRY ! https://www.uni-log.org/logic-prize-world
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