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    A definition that yields extensionality only by collapsin... — Carmelics
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    Challenges→The extensionality of classes is a derived result, not a postulate.

    A definition that yields extensionality only by collapsing intensional differences between properties does not derive extensionality but stipulates it under a redescription.

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    Modality & Possibility1 linkedPhilosophy of Language1 linked

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    The extensionality of classes is a derived result, not a postulate.

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