Various sources in the literature claim that the deduction theorem does not hold for normal modal or epistemic logic, whereas others present versions of the deduction theorem for several normal modal ...

Journal of Philosophical Logic, Vol. 44, No. 3 (June 2015), pp. 237-258 (22 pages) Harold Hodes in [1] introduces an extension of first-order modal logic featuring a backtracking operator, and ...

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Editor's Note: This article was provided by The Conversation. The original can be found here. Calling something a “scientific truth” is a double-edged sword. On the one hand it carries a kind of ...