Munich Center for Mathematical Philosophy (MCMP)
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Talk: Hans Rott (Regensburg)

Location: Ludwigstr. 31, ground floor, Room 021.

08.01.2020 16:00  – 18:00 

Title:

Difference-making conditionals and the Relevant Ramsey Test

Abstract:

This talk explores conditionals expressing that the antecedent makes a difference for the consequent. A 'relevantised' version of the Ramsey Test for conditionals is employed in the context of the classical theory of belief revision. The idea of this test is that the antecedent is relevant to the consequent in the following sense: a conditional is accepted just in case (i) the consequent is accepted if the belief state is revised by the antecedent _and_ (ii) the consequent fails to be accepted if the belief state is revised by the antecedent's negation. The connective thus defined violates almost all of the traditional principles of conditional logic, but it obeys an interesting logic of its own.
The paper also gives the logic of an alternative version, the 'Dependent Ramsey Test', according to which a conditional is accepted just in case (i) the consequent is accepted if the belief state is revised by the antecedent _and_ (ii) the consequent is rejected (e.g., its negation is accepted) if the belief state is revised by the antecedent's negation. This conditional is closely related to David Lewis's counterfactual analysis of causation.