The Logic of Conceivability

Graham Priest


LoC online seminar session on Wednesday, May 12 : Graham Priest on Mission Impossible.

Time: 17:00- 19.00 (Amsterdam time)

Location: virtually (zoom)

If you are interested in attending the talk, please, contact Anthia Solaki (a.solaki2 at uva dot nl) to get the zoom link. 

Title: Mission Impossible
Abstract: 

Saul Kripke's work on the semantics of non-normal modal logics introduced the idea of non-normal worlds, worlds where logically impossible things may hold. Such worlds can naturally be thought of as impossible worlds. Since Kripke's invention, the notion of an impossible world has undergone much fruitful development and application. Impossible worlds may be of different kinds—or maybe different degrees of impossibility; and these worlds have found application in many areas where hyperintensionality appears to play a significant role: intentional mental states, counterfactuals, meaning, property theory, to name but a few areas. But what, exactly, is an impossible world? How is it best to characterise the notion? To date, the notion is used more by example than by definition. In this talk I will investigate the question and propose a general  characterisation, suitable for all standard purposes and tastes. In particular, it can be deployed whatever one takes the correct logic to be.

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