Abduction, Conversational Implicature and Misleading in Human Dialogues
Chiaki Sakama and Katsumi Inoue
Logic Journal of the IGPL, vol.24(4), pages 526-541, 2016.
In this article, we first study abduction in human dialogues.
Given an utterance, objective abduction produces a hearer's belief that could explain the utterance,
while subjective abduction produces a hearer's belief that could explain the belief state of a speaker.
Different types of abduction are formulated using propositional epistemic logic.
We next consider conversational implicature used as pragmatic inference in speech acts.
Two conflicting implicatures, Q-implicature and I-implicature, are formulated and contrasted with abduction.
We also argue how speakers could use abduction or conversational implicature for the purpose of misleading hearers.