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    Carmelics

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    LoyalLoyalJusticeJustice
    Made withinDC&Austin
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    Home/Original/inverse
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    Inverse View

    It is not the case that Geach's relative identity thesis does not require avoiding contradiction but rather rejects the unrestricted use of Leibniz's Law across sortal kinds.

    ?Set your confidence on the premises below to see your aggregate.

    Reasons For

    1 perspective
    Reason for
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    • 1.If x is identical to y under sortal F but not under sortal G, then x and y really differ in some property, making the identity claims genuinely contradictory.
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    • 2.Restricting Leibniz's Law merely postpones the problem—we must still explain why 'same object, different sortals' doesn't constitute real difference.
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    • 3.Standard identity is transitive and unrestricted by design. Sortal-indexed identity ('identical-as-F') is a different relation, not true identity itself.
      ?

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    Reasons Against

    1 perspective
    Reason against
    ?
    • 1.Identity claims like 'the statue is the clay' are true under sortal 'physical object' but false under 'lump of clay,' showing identity is sortal-relative.
      ?

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    • 2.Leibniz's Law assumes absolute identity: if x=y, all properties match. But sortal-relative identity permits x=y under one sortal while x≠y under another.
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    • 3.Restricting Leibniz's Law to same-sortal comparisons avoids contradiction without denying the legitimacy of cross-sortal identity judgments.
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