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Full Idea
At t1 there is a whole CAR, and a PART of it, which is everything except the right front wheel. At t2 the wheel is removed, leaving just PART, so that CAR is now PART. But PART was a proper part of CAR, and CAR had the front wheel. Different properties!
Gist of Idea
A CAR and its major PART can become identical, yet seem to have different properties
Source
André Gallois (Occasions of Identity [1998], 1.II)
Book Ref
Gallois,André: 'Occasions of Identity' [' 1998], p.15
A Reaction
[compressed summary] The problem is generated by appealing to Leibniz's Law. My immediate reaction is that this is the sort of trouble you get into if you include such temporal truths about things as 'properties'.
| 16025 | If things change they become different - but then no one thing undergoes the change! [Gallois] |
| 16026 | 4D: time is space-like; a thing is its history; past and future are real; or things extend in time [Gallois] |
| 16027 | If two things are equal, each side involves a necessity, so the equality is necessary [Gallois] |
| 16233 | Gallois hoped to clarify identity through time, but seems to make talk of it impossible [Hawley on Gallois] |
| 14755 | Gallois is committed to identity with respect to times, and denial of simple identity [Gallois, by Sider] |
| 16231 | Occasional Identity: two objects can be identical at one time, and different at others [Gallois, by Hawley] |
| 13437 | A CAR and its major PART can become identical, yet seem to have different properties [Gallois] |