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    In many-sorted logic, the choice of whether sorts must be... — Carmelics
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    Challenges→Each consistent set of many-sorted formulas has a model, making syntactic consistency and semantic satisfiability equivalent

    In many-sorted logic, the choice of whether sorts must be non-empty, disjoint, or allow subsort relations introduces semantic underdetermination not present in single-sorted first-order logic.

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    Key Terms

    Disjoint (in logic)(as used in logic and set theory)
    Completely separate with no overlap—like two groups that share no members in common.
    Non-empty(in logic and set theory)
    Containing at least something; not blank or void. (A 'non-empty world-description' is one that actually describes something real.)
    Semantic underdetermination(as used in logic and philosophy of language)
    A situation where the rules of a logical system don't fully decide what something means, leaving multiple interpretations possible.
    Single-sorted first-order logic(as used in logic and philosophy)
    The standard logical system most people learn, which treats all objects as one type and makes basic statements about what properties they have.
    Sorts (in logic)

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    (as used in formal logic)
    Categories or types that organize different kinds of objects in a logical system—like having separate boxes for 'people,' 'numbers,' and 'colors' instead of mixing everything together.
    Subsort relations(as used in formal logic)
    Connections where one category is a smaller part of another, like how 'dogs' is a subsort of 'animals.'
    many-sorted logic(Logic foundations and translations)
    A logic that accommodates reasoning about more than one sort (type) of objects, generalizing first-order logic by allowing multiple base types.

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    Truth & Knowledge1 linkedPhilosophy of Language1 linked

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    Each consistent set of many-sorted formulas has a model, making syntactic consis...

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