Found 2 items, similar to modal logic.
English → English (WordNet) Definition: modal logic modal logic n 1: the logical study of necessity and possibility 2: a system of logic whose formal properties resemble certain moral and epistemological concepts
English → English (gcide) Definition: modal logic modal logic \mo“dal log”ic\, n. A system of logic which studies how to combine propositions which include the concepts of necessity, possibility, and obligation. [PJC]