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    Unrestricted substitution may be theoretically unmotivate... — Carmelics
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    Challenges→If substitutional validity under unrestricted term-substitution extensionally coincides with all valid inferences, positing additional criteria adds no explanatory power.

    Unrestricted substitution may be theoretically unmotivated; alternative criteria justified by independent principles (e.g., semantic grounds) deserve consideration regardless of coincidence.

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    Key Terms

    Independent principles(as used in philosophy of language)
    Rules or foundations that stand on their own and don't depend on other ideas to make sense.
    Semantic grounds(as used in philosophy of language)
    Reasons based on the actual meaning of words and how language works, rather than just how things happen to be grouped together.
    Theoretically unmotivated(as used in philosophy of language)
    Something that doesn't have a good philosophical or logical reason backing it up; it's done without solid justification from theory.
    Unrestricted substitution(as used in logic and semantics)
    The idea that you can swap out words or concepts for other words or concepts anywhere in a statement without changing the meaning or truth of that statement.
    coincidence

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    (Aristotle's four-cause framework)
    An event that does not occur for the sake of anything; an event without a final cause.
    criteria(Dworkin's term for what he attributes to positivist legal theorists like Hart)
    Uncontroversial shared tests used by lawyers to determine the truth of propositions of law

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    If substitutional validity under unrestricted term-substitution extensionally co...

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    If substitutional validity under unrestricted term-substitution extensionally co...

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