Relevant and substructural logics

Publisher Summary This chapter discusses proof theory of relevant and substructural logics, and the model theory of these logics. The discipline of relevant logic grew out of an attempt to understand notions of consequence and conditionality where the conclusion of a valid argument is relevant to the premises, and where the consequent of a true conditional is relevant to the antecedent. The structural rules dictate admissible forms of transformations of premises contained in proofs. The chapter discusses how relevant logics are naturally counted as substructural logics, as certain commonly admitted structural rules are responsible for introducing irrelevant consequences into proofs.

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