Saul Kripke
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"Saul Aaron Kripke" is an American philosopher and logician. He is currently McCosh Professor of Philosophy, Emeritus, at Princeton University and teaches as a Distinguished Professor of Philosophy at the CUNY Graduate Center. Since the 1960s Kripke has been a central figure in a number of fields related to mathematical logic, philosophy of language, philosophy of mathematics, metaphysics, epistemology, and set theory. Much of his work remains unpublished or exists only as tape-recordings and privately circulated manuscripts. Kripke was the recipient of the 2001 Schock Prize in Logic and Philosophy. A recent poll conducted among philosophers ranked Kripke among the top ten most important philosophers of the past 200 years.

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Proper names are rigid designators.

Any necessary truth, whether a priori or a posteriori, could not have turned out otherwise.

It really is a nice theory. The only defect I think it has is probably common to all philosophical theories. It's wrong.