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Philosophy  /  Philosophy 0187  ·  Atom · ~20 seconds

Numerical and Qualitative Identity

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Numerical identity means being one and the same thing; qualitative identity means exact similarity. Personal identity asks about the first, not the second.

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Identical twins are qualitatively alike but numerically two. Yesterday's you and today's you are numerically one, however much you changed.

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Conflating the two wrecks every puzzle ahead—"an identical copy" is never automatically you.