Abstract
As is well known Saul Kripke believes that identities hold of necessity.' That is, if a is identical with b then a is identical with b in any possible world in which either a or b exists. This metaphysical thesis is, in Kripke's view, supported by the linguistic thesis that certain terms, notably proper names, function as rigid designators. More precisely, if 'a' and 'b' are rigid designators then the identity sentence 'a = b' is, if true, necessarily true. *Let us call this thesis the rigid designation thesis. The main argument for the rigid designation thesis is set forth by Susan Haak in her book Philosophy of Logics:
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