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even though in other logically possible worlds
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the identity comes apart.
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Identity is not necessary,
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but contingent, as the philosophers put it."
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It's not clear that that's right either.
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The notion of contingent identity is very puzzling.
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After all, if A really is B,
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how could they come apart?
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There's only one thing there.
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There's nothing to come apart.
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There's just A equals B, that single thing.
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What's to come apart?