more from Nathan Salmon

Single Idea 14742

[catalogued under 7. Existence / D. Theories of Reality / 9. Vagueness / g. Degrees of vagueness]

Full Idea

Insofar as identity seems vague, it is provably mistaken. If it is vague whether x and y are identical (as in the Ship of Theseus), then x,y is definitely not the same as x,x, since the first pair is indeterminate and the second pair isn't.

Gist of Idea

It can't be indeterminate whether x and y are identical; if x,y is indeterminate, then it isn't x,x

Source

Nathan Salmon (Reference and Essence: seven appendices [2005], App I)

Book Reference

Salmon,Nathan: 'Reference and Essence (2nd ed)' [Prometheus 2005], p.243


A Reaction

[compressed; Gareth Evans 1978 made a similar point] This strikes me as begging the question in the Ship case, since we are shoehorning the new ship into either the slot for x or the slot for y, but that was what we couldn’t decide. No rough identity?