Hyperintensionality, opacity, and counterpossibles

Series: Logic and Philosophy Abstract: According to the orthodoxy, counterpossibles (i.e., counterfactuals with an impossible antecedent) are all vacuously true (Stalnaker 1968, Lewis 1973, Williamson 2017). However, a growing number of reformers defend the idea that some counterpossibles are false and not all true by default (Brogaard and Salerno 2013, Berto et al.