more from David Wiggins

Single Idea 14362

[catalogued under 9. Objects / F. Identity among Objects / 3. Relative Identity]

Full Idea

Wiggins argues that Geach's Relative Identity is incompatible with the formal properties of identity, which include, besides transitivity, symmetry and reflexivity, the complete community of properties defined by the Indiscernibility of Identicals.


The Indiscernibility of Identicals is often called Leibniz's Law

Gist of Idea

Relative Identity is incompatible with the Indiscernibility of Identicals


report of David Wiggins (Sameness and Substance Renewed [2001]) by Peter F. Strawson - Review of 'Sameness and Substance' p.603

Book Reference

-: 'Mind' [-], p.603

A Reaction

The tricky part is that Wiggins then goes on to say that identity depends on sortals, which sounds very close to the Geach view. I find disentangling them tricky. See Idea 14363 for a helpful comment from Strawson.

Related Idea

Idea 14363 Identity a=b is only possible with some concept to give persistence and existence conditions [Wiggins, by Strawson,P]