Necessity, Apriority, and True Identity Statements

Erkenntnis 40 (2):227 - 242 (1994)
The thesis that the necessary and the a priori are extensionally equivalent consists of two independent claims: 1) All a priori truths are necessary and 2) all necessary truths are a priori. In Naming and Necessity1 Saul A. Kripke gives examples of necessary but a posteriori truths, so he disagrees with the second leg of the thesis.2 His examples are of two types; on the one hand statements involving essential properties and on the other hand true identity statements. My concern will be with examples of the second type and whether they refute (2). (2), however, is ambiguous and can mean one of three things.
Keywords necessary  a priori  identity statements  extension equivalence
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DOI 10.1007/BF01128594
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References found in this work BETA
Saul Kripke (2010). Naming and Necessity. In Darragh Byrne & Max Kölbel (eds.), Philosophy. Routledge 431-433.
Saul A. Kripke (1979). A Puzzle About Belief. In A. Margalit (ed.), Meaning and Use. Reidel 239--83.

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