A Logical Account of Lying

Chiaki Sakama, Martin Caminada and Andreas Herzig

Proceedings of the 12th European Conference on Logics in Artificial Intelligence (JELIA 2010), Lecture Notes in Artificial Intelligence 6341, Springer-Verlag, pages 286-299, 2010.


This paper aims at providing a formal account of lying -- a dishonest attitude of human beings. We first formulate lying under propositional modal logic and present basic properties for it. We then investigate why one engages in lying and how one reasons about lying. We distinguish between offensive and defensive lies, or deductive and abductive lies, based on intention behind the act. We also study two weak forms of dishonesty, bullshit and deception, and provide their logical features in contrast to lying. We finally argue dishonesty postulates that agents should try to satisfy for both moral and self-interested reasons.

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