Rothschild, Daniel; Stephen, Yablo; (2023) Permissive updates. In: Faroldi, Federico and Van De Putte, Frederik, (eds.) Kit Fine on Truthmakers, Relevance, and Non-classical Logic. (pp. 615-662). Springer: Cham, Switzerland.

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Abstract

David Lewis asked in “A problem about permission” about the effects on context, specifically on the “sphere of permissibility,” of allowing behavior that had previously been forbidden. The framework of truthmaker semantics sheds useful light on this problem. Update procedures are definable in the truthmaker framework that capture more than Lewis was able to just with worlds. Connections are drawn with epistemic modals, belief revision and the semantics of exceptives. We consider how a truthmaker account of permissive update might be integrated into a larger semantic/pragmatic account of deontic language. Bridge principles are articulated associating types of deontic act with distinct update rules. Distinct forms of permission trigger distinct procedures because they aim at spheres more or less strongly verifying ◊ϕ, the claim that ϕ is permissible

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