Single Idea 12835

[catalogued under 9. Objects / B. Unity of Objects / 3. Unity Problems / b. Cat and its tail]

Full Idea

The cat is 'Tibbles' with a tail; 'Tib' is Tibbles after the loss of the tail. 1) Tibbles isn't Tib at t; 2) Tibbles is Tib at t'; 3) Tibbles at t is Tibbles at t'; 4) Tib at t is Tib at t'; so 5) Tibbles at t is Tib at t (contradicting 1). What's wrong?

Gist of Idea

Does Tibbles remain the same cat when it loses its tail?


Peter Simons (Parts [1987], 3.3)

Book Reference

Simons,Peter: 'Parts: a Study in Ontology' [OUP 1987], p.119

A Reaction

[The example is in Wiggins 1979, from Geach, from William of Sherwood] Simons catalogues nine assumptions which are being made to produce the contradiction. 1) rests on Leibniz's law. Simons says two objects are occupying Tibbles.