Finding an Intrinsic Account of Identity: What is the Source of Duplication Cases?
Sidelle (Alan)
Source: Philosophy and Phenomenological Research 61, No. 2, Sep., 2000, pp. 415-430
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Philosophers Index Abstract

    The obvious intrinsic approach--perhaps taken for granted--appeals to considerations of quantity of matter, requiring over 50% shared matter between identicals (at adjacent times). But this rules out plausible cases of halving and doubling for which there are not duplication1 cases. After bringing out this problem, I ask what makes duplication2 cases possible, and use this to formulate an intrinsic condition which allows identity whenever there is continuity of function, but no threat to intrinsicness via duplication3 cases. (edited)

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