Abstract

Jonathan Bennett, in his (2003), says that for indicative conditionals the unrestricted form of modus ponens (MP) is not valid, but restricted MP is still valid. In this paper I argue that Bennett is wrong, that even the restricted form of MP fails for indicative conditionals. I will show this by constructing, from his own counterexample to other formal properties of indicatives, a counterexample which is immune to the types of criticism that Bennett launches against the famous counterexample to MP by Vann McGee. I will also show that this type of failure of MP can be confirmed visually by a new but natural reading of the Adams-style Venn diagram.

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