Karczewska, Anna Maria2023-03-142023-03-142012Studia Paradyskie, 2012, t. 22, s. 109-120.0860-8539http://theo-logos.pl/xmlui/handle/123456789/5128Modal logic is intended to be the logic of modality, the logic of necessity and possibility. Modal notions are deeply problematic even without the appeal to modal logic. Moreover, there are a number of modal logics and each of them formalize the logical relations between modal sentences in a different way. The objective of this paper is to present main propositional normal modal calculus and consider selected problems concerning the interpretation of the modal connectives in the propositional modal logic.plAttribution-ShareAlike 3.0 Polandhttp://creativecommons.org/licenses/by-sa/3.0/pl/logikalogika modalnafunktorfunktor modalnymodalność iterowanalogicmodal logicfunctormodal functoriterated modalityArticle