Questions, Justification Requests, Inference, and Definition

August 2024

Questions, Justification Requests, Inference, and Definition (to appear in a Synthese collection on non-assertoric-speech acts)

In this paper, I examine connections between the speech acts of assertion, denial, polar questions and justification requests, and the common ground. When we pay attention to the structure of norms governing polar questions, we can clarify the distinction between strong and weak denial, together with the parallel distinction between strong and weak assertion, and the distinct way that these speech acts interact with the common ground. In addition, once we pay attention to the distinct norms concerning justification requests, we can give a distinctive answer to Carroll’s puzzle concerning the force of the logical must, and the sense in which certain rules for logical concepts can indeed count as definitions.

This paper is to appear in a Synthese edited collection on non-assertoric speech acts.


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I’m Greg Restall, and this is my personal website. I am the Shelby Cullom Davis Professor of Philosophy at the University of St Andrews, and the Director of the Arché Philosophical Research Centre for Logic, Language, Metaphysics and Epistemology I like thinking about – and helping other people think about – logic and philosophy and the many different ways they can inform each other.

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