The author attacks the view that identity, Like largeness, Is a relative relation. The primary advocate of the view that identity is relative is p.T. Geach. It is argued that geach has not shown that the failure of the identity of indiscernibles principle, As a truth of logic, Forces us to stop taking indiscernibility within particular formal theories or languages as a sufficient condition for identity. The author also argues that the whole notion of relative identity, As explicated by geach, (...) Is very probably incoherent. (shrink)

On his very first page Feldman ascribes to me a claim about the relation expressed by 'is identical with'. Feldman's way of speaking is, as Ryle might say, systematically misleading: for of course I deny that any one relation, even a relative relation, is the relation expressed by 'is identical with'. My whole thesis was that 'is identical with' expressed now one, now another, relation, according to the context of utterance.

It would seem that Geach's claim is that the relation expressed by 'is identical with' is like the relation expressed by 'is better than', at least in one respect. If x and y are people, it may turn out that x is a better golfer than y, while y is a better poet than x. If we merely say that x is better than y, we fail to specify the respect in which we hold x to be the better. Another (...) way to put this is to say that we have not made clear "in relation to what" x is the better. We can call the relation expressed by 'is better than' a "relative relation," since an ordered pair of things may stand in that relation relative to one thing but not relative to another thing. Geach seems to think that identity is a relative relation. (shrink)