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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, : 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Idempotency of entailment」の詳細全文を読む スポンサード リンク
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