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    Therefore, provability from first-order axioms tracks for... — Carmelics
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    Challenges→Sentences proved from first-order axioms are true in all models of those axioms, including countable models and non-standard models

    Therefore, provability from first-order axioms tracks formal satisfiability across structures, not truth about the mathematical domain the axioms were designed to characterize.

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    1 reason for
    1 reason against

    Reasons For

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    Reason for
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    • 1.Gödel's completeness theorem shows first-order logic is semantically complete only for satisfiability, not mathematical truth about infinite structures.
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    • 2.Non-isomorphic models satisfying identical first-order axioms (e.g., standard vs non-standard arithmetic) proves provability doesn't determine unique mathematical content.
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    • 3.Second-order logic captures intended models better than first-order, suggesting first-order axiomatization inherently underdetermines mathematical reality.
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    Reasons Against

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    Reason against
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    • 1.The distinction between 'formal satisfiability' and 'truth in the domain' presupposes mathematical realism; constructivists deny this gap exists fundamentally.
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    • 2.Provability from axioms successfully predicts and constrains mathematical practice across fields, suggesting it tracks something more robust than mere satisfiability.
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    • 3.Non-standard models don't falsify the axioms—they satisfy them. That multiple models exist doesn't entail the axioms fail to characterize their intended domain.
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    Connections

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    Proof of definition segments1 linkedTruth & Knowledge1 linked

    Related

    Gödel's completeness theorem shows first-order logic is semantically complete on...Non-isomorphic models satisfying identical first-order axioms (e.g., standard vs...Non-standard models don't falsify the axioms—they satisfy them. That multiple mo...Provability from axioms successfully predicts and constrains mathematical practi...
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    Second-order logic captures intended models better than first-order, suggesting ...Sentences proved from first-order axioms are true in all models of those axioms,...The distinction between 'formal satisfiability' and 'truth in the domain' presup...

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    claim
    Perspectives
    2 (1 for, 1 against)
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    1 edit