Kripke has argued that proper names, as rigid designators, cannot be equivalent in meaning to definite descriptions. in this paper, i argue that definite descriptions are sometimes used rigidly and that proper names are equivalent to definite descriptions used rigidly.

Reprint of the original, first published in 1869.

are synthetic a priori judgements possible?" In both cases, i~thas usually been t'aken for granted in fife one case by Kant that synthetic a priori judgements were possible, and in the other case in contemporary,'d-". philosophical literature that contingent statements of identity are ppss. ible. I do not intend to deal with the Kantian question except to mention:ssj~".