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    Categoricity in second-order logic is relative to backgro... — Carmelics
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    Challenges→If a second-order formulation of F can fix the standard model categorically, then the existence of non-standard models of first-order F reflects an expressive limitation of first-order logic, not an ineliminable feature of F's intended semantics.

    Categoricity in second-order logic is relative to background set theory; different set theories yield different 'standard' models, undercutting the argument.

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