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    If object 'a' falls under sortal G and a = b, then object... — Carmelics
    Home/Consciousness & Mind
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    If object 'a' falls under sortal G and a = b, then object 'b' also falls under sortal G and is the same G as a

    Consciousness & Mind
    ?Rate how convincing each reason is below to see the overall strength.
    1 reason for
    2 reasons against

    Reasons For

    1 perspective
    Reason for
    ?
    • 1.Object 'a' falls under sortal G
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    • 2.Object 'a' is identical to object 'b' (a = b)
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    • 3.By Leibniz's Law, identical objects share all properties
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    Reasons Against

    2 perspectives
    Reason against 1 of 2
    ?
    • 1.Sortal identity is not a purely logical relation but depends on principles of individuation tied to natural kinds and their persistence conditions.
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    • 2.Two descriptions may pick out the same object under different sortals with incompatible identity criteria, as Wiggins argues in 'Sameness and Substance'.
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    • 3.Therefore, 'a = b' as a bare logical identity cannot guarantee shared sortal membership without presupposing a privileged sortal, which begs the question.
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    Reason against 2 of 2
    ?
    • 1.Leibniz's Law applies only to genuine properties, but sortal membership is a Cambridge property sensitive to conceptual scheme, not an intrinsic feature of objects.
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    • 2.Geach's relative identity thesis holds that identity statements are only well-formed relative to a sortal, so 'a = b' simpliciter is not a coherent identity claim.
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    • 3.If identity is always sortal-relative, the inference from bare 'a = b' to shared sortal G commits a category error by presupposing absolute identity.
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    Topics

    Consciousness & Mind

    Related

    By Leibniz's Law, identical objects share all propertiesGeach's relative identity thesis holds that identity statements are only well-fo...If identity is always sortal-relative, the inference from bare 'a = b' to shared...Leibniz's Law applies only to genuine properties, but sortal membership is a Cam...
    +6 moreShow less
    Object 'a' falls under sortal GObject 'a' is identical to object 'b' (a = b)Object 'a' is the-same-G-as-a (reflexivity of sortal identity)Sortal identity is not a purely logical relation but depends on principles of in...Therefore, 'a = b' as a bare logical identity cannot guarantee shared sortal mem...Two descriptions may pick out the same object under different sortals with incom...

    Similar

    Object 'a' is identical to object 'b' (a = b)82%If an object fell under more than one ultimate sortal, there could be ...80%If the two sortals are allowed to differ in temporal scope, the predic...77%Object 'a' is the-same-G-as-a (reflexivity of sortal identity)76%

    Source

    AI-extracted1/3 agreementValid
    SEP: substance
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    The second claim is that is that if the object picked out by ‘a’ also falls under another sortal, G, then so will the object picked out by ‘b’, and it will be the same G as a. This is represented as an application of Leibniz’s Law, for if a is the-same-G-as-a (as it must be) then, as a = b, b must be the-same-G-as-a.
    Extraction notes

    Validity: Extracted via Max plan + API grounding/validity checks

    Details

    Type
    claim
    Perspectives
    3 (1 for, 2 against)
    Edits
    1 edit