Persistence through Change: David Lewis on Temporary Intrinsic Properties

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I describe how David Lewis addresses the problem of temporary intrinsic properties-properties that something or someone has at one time and not at another time. How can one thing at one time be identical with something at another time when they have differing properties? It seems to violate the law of the indiscernibility of identicals: if x is identical with y, then x and y have all properties in common.
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So what's intrinsic about the tennis ball is the rubber substance that is made of and that it does have to have a spherical shape when initially taken in hand, but that ball has the intrinsic properties of rubber (or whatever) that have the hidden ability to change shape (compress) under the intense smack of the tennis racket.

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