Single Idea 6052

[catalogued under 2. Reason / D. Definition / 1. Definitions]

Full Idea

Any definition must presuppose the notion of identity precisely because a definition affirms the identity of two concepts.

Gist of Idea

Definitions identify two concepts, so they presuppose identity

Source

Colin McGinn (Logical Properties [2000], Ch.1)

Book Reference

McGinn,Colin: 'Logical Properties' [OUP 2003], p.8


A Reaction

McGinn is arguing that identity is fundamental to thought, and this seems persuasive. It may be, though, that while identities are inescapable, definitions are impossible.