relevance logics
Logics that explore the properties of relations of implication stronger than strict implication . It was shown by C. I. Lewis that with the classical notion of entailment anything whatever follows from a contradiction, and a tautology follows from any arbitrary proposition. Logicians regarding these consequences as unacceptable have sought to define relations of entailment stronger (more restrictive) than strict implication, to preserve the distinction between good and bad ways of arguing even in the presence of contradictions and tautologies.

Philosophy dictionary. . 2011.

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  • relevance logic — relevance logics …   Philosophy dictionary

  • Relevance logic — Relevance logic, also called relevant logic, is a kind of non classical logic requiring the antecedent and consequent of implications be relevantly related. They may be viewed as a family of substructural or modal logics. (It is generally, but… …   Wikipedia

  • Relevance — is a term used to describe how pertinent, connected, or applicable something is to a given matter. A thing is relevant if it serves as a mean to a given purpose. Imagine a patient suffering a well defined disease such as scurvy caused by lack of… …   Wikipedia

  • Substructural logic — In mathematical logic, in particular in connection with proof theory, a number of substructural logics have been introduced, as systems of propositional calculus that are weaker than the conventional one. They differ in having fewer structural… …   Wikipedia

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  • entailment — The relationship between a set of premises and a conclusion when the conclusion follows from the premises, or may validly be inferred from the premises. Many philosophers identify this with it being logically impossible that the premises should… …   Philosophy dictionary

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  • Logic — For other uses, see Logic (disambiguation). Philosophy …   Wikipedia

  • Non-classical logic — Non classical logics (and sometimes alternative logics) is the name given to formal systems which differ in a significant way from standard logical systems such as propositional and predicate logic. There are several ways in which this is done,… …   Wikipedia

  • Ockham’s world and future — Arthur Gibson PHILOSOPHICAL BIOGRAPHY Ockham was born in about 1285, certainly before 1290, probably in the village of Ockham, Surrey, near London. If his epitaph is accurate, he died on 10 April 1347. Yet Conrad of Megenberg, when writing to… …   History of philosophy

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