Abstract
Modal logic is the logic of necessity and possibility, of ‘must be’ and ‘may be.’ It considers truth or falsity in other possible worlds as well as the real one. A proposition is necessary in a world if it is true in all worlds that are possible relative to that world and possible in a world if it is true in at least one world possible relative to that world. This article covers in very brief and summary form some of the basic systems and results of modal propositional logic. There follows an even briefer discussion of modal predicate logic.
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