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Call for PapersSQUARE 2014&#160;4th World Congress on the Square of Opposition&#160;Pontifical Lateran University, Vatican, May 5-9, 2014Any talk related to the square of opposition is welcome for this&#160;interdisciplinary congress gathering top researchers from all over the world&#160;(logicians, philosophers, mathematicians, theologists, linguists,&#160;semioticians, computer scientists, cognitivists, psychologists, artists). The Square : a Central Object for ThoughtThe square of opposition is a very famous theme coming from Aristotelian logic dealing with the notions of opposition, negation, quantification and proposition. It has been continuously studied by people interested in logic, philosophy and Aristotle during two thousand years. Even Frege, one of the main founders of modern mathematical logic, used it.Some people have proposed to replace the square by a triangle, on the other hand the square has been generalized into more complex geometrical objects: hexagons, octagons and even polyhedra and multi-dimensional objects.Aim of the CongressThis will be the 4th world congress organized about the square of opposition after very succesful previous events in Montreux, Switzerland 2007, Cort&#233;, Corsica 2010, Beirut, Lebanon, 2012. This is an interdisciplinary event gathering logicians, philosophers, mathematicians, semioticians, artists, cognitivists, and computer scientists.The meeting will end by a final round square table where subalterned people will express their various contrarieties, subcontrarieties and contradictions.Submission guidelinesTo submit a contribution send a one page abstract to: vatican2014@square-of-opposition.orgAll talks related to the square of oppostion are welcome, in particular those falling into the categories below.Diagrammatic and Artistic works related to the square of opposition are also welcome, send your files to Square2014@gmail.com.The deadline for submission is November 1st, 2013You will received notification before December 15th 2013.As in previous editions of the event, peer-reviewed papers will be published after the congress in a book and a special issue of a journal with publishers of international recognition.Registration feesBEFORE JANUARY 31 2014Regular registration fee EUR 150 / USD 200Reduced fee for students or people from countries with low currencies EUR 75 / USD 100ON ARRIVALRegular registration fee EUR 200 / USD 270Reduced fee for students or people from countries with low currencies EUR 150 / USD 200&#160;Scientific CommitteeJean-Pierre Descl&#233;s, Dpt of Mathematics and Informatics, University Paris-Sorbonne, FranceRen&#233; Guitart, Dpt of Mathematics, University of Paris 7, FranceLarry Horn, Dpt of Linguistics, Yale, USADale Jacquette, Dpt of Philosophy, University of Bern, SwitzerlandDominique Luzeaux, DGA, Minister of Defense, Paris, FranceTerence Parsons, Dept of Philosophy, UC Los Angeles, USAStephen Read, School of Philosophical and Anthropological Studies, University of Saint Andrews, ScotlandHans Smessaert, Dpt of Linguistics, Catholic University of Leuven, BelgiumPeter Schr&#246;der-Heister, Dpt of Informatics, University of T&#252;bingen, GermanyJan Wolenski, Dept of Philosophy, Krakow, Poland&#160;