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General Philosophy

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Locke on the Identity of Matter<br />

5<br />

The appropriate criterion of identity over<br />

time depends on the kind of thing it is:<br />

– A single particle of matter retains its identity as<br />

long as it continues in existence. So a and b<br />

are the same particle of matter if there is a<br />

continuous history connecting them.<br />

– The identity of a body of matter depends on the<br />

identity of the particles that constitute it. It’s s the<br />

same body iff it’s s the same collection of<br />

particles, even if differently arranged. (However<br />

this too seems to require a continuous history.)

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