Graduate studies at Western
|Abstract||Many philosophers ponder the question of the a priori status of logical rules like modus ponens. In this paper I argue that the way in which such questions are usually posed is misguided. I argue that to accept modus ponens is nothing else than to have an implication; hence that to ask how do we know that implication obeys modus ponens does not make sense. To ask whether modus ponens is a priori is to ask whether having implication is a priori. I argue that as one is not born with a language (but perhaps only with a predisposition to acquire a certain kind of language, namely one posessing logical vocabulary and hence displaying logical structure), logical rules can be a priori only in the sense that we tend to acquire language governed by such rules.|
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