Concept
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, In linear and affine logic, entailment is not idempotent.
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