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idempotency of entailment : ウィキペディア英語版 | idempotency of entailment
Idempotency of entailment is a property of logical systems that states that one may derive the same consequences from many instances of a hypothesis as from just one. This property can be captured by a structural rule called contraction, and in such systems one may say that entailment is idempotent if and only if contraction is an admissible rule. Rule of Contraction: from A,C,C -> B is derived A,C -> B. Or in sequent calculus notation, :
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