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    Classical logic's structural rules can be justified throu... — Carmelics
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    Challenges→If logical validity requires variable sharing, then classical logic's most central structural rules—including ex falso quodlibet—are rendered invalid, contradicting centuries of logical practice endorsed by Frege, Russell, and Hilbert.

    Classical logic's structural rules can be justified through semantic models and proof-theoretic properties independent of variable-sharing constraints.

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