Abstract
AbstractModal logics address uncertainty about truth values of statements by introducing and discussing the notion of possibility of truth in addition to the necessity of truth. In this, modal logics trespass the boundary between the realm of dichotomy true-false into the less transparent realm of certainly true-possibly true. As the latter is less rigorous about truth and the notions of necessity and possibility are open to various interpretations, the result is the existence of many variants of modal logics. We will follow in this chapter some line of more and more complex interpretations of necessity and possibility as well as their mutual relations.
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