Single Idea 11845

[catalogued under 9. Objects / F. Identity among Objects / 8. Leibniz's Law]

Full Idea

Leibniz's Law underwrites the substitutivity of identity and this is a principle not long dispensable in any form of reasoning.

Gist of Idea

Substitutivity, and hence most reasoning, needs Leibniz's Law

Source

David Wiggins (Sameness and Substance Renewed [2001], 2.7)

Book Reference

Wiggins,David: 'Sameness and Substance Renewed' [CUP 2001], p.46


A Reaction

Thus the modern fashion of deriving our metaphysics from our logic. Presumably we can derive it from our epistemology too, or even from our intuitions, if we thought they were good enough as evidence.