When determining whether an instance of an argument form is a counterexample to that form, it is crucial to hold the context fixed when evaluating the truth values of the statements comprising the possible counterexample. It is generally conceded that counterfactual conditionals are semantically context dependent, and, in a discussion of such conditionals, Brogaard and Salerno (2008) argue that apparent counterexamples to hypothetical syllogism, strengthening the antecedent and contraposition all trade on a failure to hold fixed the context in which the premisses and conclusion are assigned truth values. In particular, they claim, the familiar collection of counterexamples cited in connection with the semantic theories of Stalnaker (1968) and Lewis (1973) are guilty of this failure:

The ability of the possible worlds account to explain the...

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