R. K. Meyer once gave precise form to the question of whether relevant implication can be defined in any modal system, and his answer was `no'. In the present paper, we extend S4, first with ...
Journal of Philosophical Logic, Vol. 22, No. 5 (Oct., 1993), pp. 449-479 (31 pages) Craig's interpolation theorem fails for the propositional logics E of entailment, R of relevant implication and T of ...
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