Does Williamson’s Suppositional Heuristic Have a Problem with Counterpossibles?
Issue: • Author/s: Alessandro Torza
Topics: Metaphysics, Modal Logic, Philosophical logic, Philosophy of language, Philosophy of logic
Timothy Williamson has defended two hypotheses concerning counterfactual conditionals: that necessity can be defined in counterfactual terms; and that we follow a heuristic to the effect that a counterfactual is assessed by assessing the consequent while counterfactually supposing the antecedent. The two hypotheses form the bedrock for a program aiming to reduce the epistemology of modality to the epistemology of counterfactual thinking. This paper argues that the pair of theses, if construed as Williamson intends it, has the unwanted consequence of trivializing our judgements about necessity and possibility, thus threatening…