Does the Implication Elimination Rule Need a Minor Premise?
DOI:
https://doi.org/10.12775/LLP.2017.019Słowa kluczowe
natural deduction, NJ, proof-theoretic semantics, grounds for assertion, term assignmentAbstrakt
The paper introduces NJ g , a variant of Gentzen’s NJ natural deduction system, in which the implication elimination rule has no minor premise. The NJ g -systems extends traditional ND-system with a new kind of action in derivations, assumption incorporation, a kind of dual to the assumption discharge action. As a result, the implication (I/E)-rules are invertible and, almost by definition, harmonious and stable, a major condition imposed by proof-theoretic semantics on ND-systems to qualify as meaning-conferring. There is also a proof-term assignment to NJ g -derivations, materialising the Curry-Howard correspondence for this system.
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