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    Quine's substitutional account shows formal invalidity ca... — Carmelics
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    Challenges→Demonstrating the formal invalidity of an argument via counterexample presupposes a principled way of discerning the full logical structure of that argument, and hence of distinguishing logical constants from nonlogical constants.

    Quine's substitutional account shows formal invalidity can be demonstrated by uniform substitution of nonlogical terms without presupposing a fixed logical/nonlogical distinction.

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