more from Peter Simons

Single Idea 12817

[catalogued under 9. Objects / C. Structure of Objects / 8. Parts of Objects / b. Sums of parts]

Full Idea

Classical extensional mereology won't extend well to temporal and modal facts, because of 'mereological extensionality', which is the thesis that objects with the same parts are identical (by analogy with the extensionality of sets).

Gist of Idea

'Mereological extensionality' says objects with the same parts are identical


Peter Simons (Parts [1987], Intro)

Book Reference

Simons,Peter: 'Parts: a Study in Ontology' [OUP 1987], p.1

A Reaction

Simons challenges this view, claiming, for example, that the Ship of Theseus is two objects rather than one. I suppose 'my building bricks' might be 'your sculpture', but this is very ontologically extravagant. This is a mereological Leibniz's Law.