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    If propositions with empty subject ideas lack truth value... — Carmelics
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    Challenges→A proposition with an empty subject idea is trivially false.

    If propositions with empty subject ideas lack truth value rather than bearing falsity, Bolzano's trivial falsity claim commits a category error by presupposing bivalence without justification.

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    Key Terms

    Bolzano (Bernard Bolzano)(as a historical reference)
    An 18th-19th century mathematician and philosopher who developed important ideas about logic, propositions, and truth. He argued that some statements about non-existent things are simply false.
    Category error(as used in logic and philosophy of language)
    A logical mistake where you apply a rule or concept to something it doesn't actually fit, like using a math formula on a poem.
    Empty subject ideas(as used in philosophy of language)
    Concepts that refer to things that don't actually exist, like 'unicorns' or 'the present King of France.' The subject of the statement doesn't pick out anything real.
    Truth value(as used in logic)
    Whether a statement is true or false—it's the truth property that any claim possesses.

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    bivalence(Stoic logic; Chrysippus's position on contingent future propositions)
    The truth table defining logical connectives contains only two values, true and false; every proposition is either true or false.
    propositions(Answer to the question of what metaphysical category propositions belong to)
    Entities belonging to a sui generis metaphysical category of their own kind, not reducible to other categories

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    Truth & Knowledge1 linkedPhilosophy of Language1 linked

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    A proposition with an empty subject idea is trivially false.

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