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16. Persons / D. Continuity of the Self / 1. Identity and the Self

[deciding when two selves are actually identical]

4 ideas
One soul can't be more or less of a soul than another [Plato]
Is Socrates the same person when standing and when seated? [Aristotle]
Psychologists are interested in identity as a type of person, but philosophers study numerical identity [Parfit]
Personal identity is a problem across time (diachronic) and at an instant (synchronic) [Lowe]