Here are two theses about the relation between ‘if-then’ and ‘⊃’. Peter van Inwagen, John Cardinal O’Hara Professor of Philosophy, will call them, respectively—and perhaps tendentiously—, the Wrong Thesis and the Right Thesis. In this paper, he will reject the Wrong Thesis and defend the Right Thesis. Then he will present what he considers a proof that an indicative conditional is false if its antecedent is true and its consequent false—and true otherwise. He will go on to consider a wide range of sentences and arguments that various philosophers have supposed raise insuperable or at least serious difficulties for this position.
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All are welcome. Reception to follow in the Philosophy library.