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It is not the case that The Curry-Howard correspondence maps proof *structures*, but classical logic proofs lack the constructive witnesses required for type inhabitation.
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Reasons For
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1.
Classical logic can be embedded in intuitionistic logic via CPS translation; proofs still correspond to types, just indirectly.
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2.
Curry-Howard applies to classical systems too (e.g., call/cc in typed languages), mapping to control operators rather than pure lambdas.
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3.
The claim conflates 'lacks direct witnesses' with 'lacks type inhabitation'—these are different properties; classical proofs inhabit different type structures.
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Reasons Against
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Reason against
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1.
Classical proofs use excluded middle and indirect arguments that don't construct explicit witnesses needed for computational type inhabitation.
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2.
Intuitionistic logic naturally produces lambda terms; classical logic requires double-negation elimination, which lacks direct computational content.
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3.
Type theory interprets proofs as programs, but classical tautologies like (P∨¬P) don't yield computable functions without additional axioms.
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