Theoria 4 (1):55-79 (
1988)
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Abstract
This paper sketches a history of definition of identity from the Aristotle’s Topics down to the modern set theory. The author tries to explain particularly: first, how the transformation of the concept of predicate at the end of the nineteenth century made it necessary to revise the leibnitian definition of the identity of individuals; secondly, why Dedekind, Peano, Schröder, etc. made, between two possible definitions of identity of predicates or of sets, a choice which later made it necessary to postulate in set theory the axiom of extensionality