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Dialogical and Illocutionary Logics

DV

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Daniel Vanderveken

Résumé de la communication

In chapter 16, On How to Be a Dialogician, Shahid Rahman and Laurent Keiff present the dialogical approach to logic. The two protagonists (proponent and opponent) perform illocutionary acts in standard dialogues of dialogical logic. The first utterance is an assertion by the proponent which fixes the thesis. Other utterances are attacks and defences. Attacks are questions or demands. Defences are responses that serve to justify a previous assertion. The second utterance is always an attack by the opponent who questions the thesis. The proponent can next reply by making either a defence or a counterattack. And so on. In dialogical logic force is part of meaning. We should combine illocutionary and dialogical logics in order to study the dynamics of discourse. Dialogues of dialogical logic serve to check the validity of an initial assertion. It is important to explicate the illocutionary nature of their utterances. The initial move is a hypothesis with special propositional content and preparatory conditions. Most defences are categorical assertions but some are rather conditional assertions. Furthermore attacks are always directive utterances. It is clear that in ordinary discourse protagonists can challenge any felicity condition and not only satisfaction conditions of previous utterances. Couldn’t we generalize dialogical logic by admitting such moves in dialogical logic?

Résumé du colloque

Cette activité de discussion théorique interdisciplinaire sur langage, pensée et action servira aussi de lancement au Québec du livre collectif de Daniel Vanderveken LOGIC, THOUGHT & ACTION paru dans la collection Logic, Epistemology and the Unity of Science de Springer en 2005. Les directeurs de la collection, John Symons (de l’université du Texas) et Shahid Rahman (de l’université de Lille) seront présents. Des conférenciers de marque étrangers et canadiens y participeront.

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