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9. Objects / E. Objects over Time / 1. Objects over Time

[general ideas about sameness of objects over time]

13 ideas
Something must be unchanging to make recognition and knowledge possible [Aristotle on Parmenides]
Identity means that the idea of a thing remains the same over time [Locke]
Changeable accidents are modifications of unchanging essences [Leibniz]
If we consider an object at two different times, we attribute identity if we perceive unity between them [PG on Hume]
Continuity is needed for existence, otherwise we would say a thing existed after it ceased to exist [Reid]
An a priori principle of persistence anticipates all experience [Kant]
No one seems to know the identity conditions for a material object (or for people) over time [Kripke]
'What is it?' gives the kind, nature, persistence conditions and identity over time of a thing [Wiggins]
A thing 'perdures' if it has separate temporal parts, and 'endures' if it is wholly present at different times [Lewis]
If things change they become different - but then no one thing undergoes the change! [Gallois]
Gallois hoped to clarify identity through time, but seems to make talk of it impossible [Hawley on Gallois]
A continuous object might be a type, with instances at each time [Ladyman/Ross]
Most criteria for identity over time seem to leave two later objects identical to the earlier one [Cameron]