Relational semantics for the 4-valued relevant logics BN4 and E4
Keywordsrelevant logics, many-valued logics, 4-valued logics, Routley-Meyer semantics
AbstractThe logic BN4 was defined by R.T. Brady in 1982. It can be considered as the 4-valued logic of the relevant conditional. E4 is a variant of BN4 that can be considered as the 4-valued logic of (relevant) entailment. The aim of this paper is to define reduced general Routley-Meyer semantics for BN4 and E4. It is proved that BN4 and E4 are strongly sound and complete w.r.t. their respective semantics.
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