Özet:

Ruth Barcan Marcus is one of the leading names of contemporary logic studies. The Barcan and Evrik Barcan complements, the schemes which the Niceleyers and modal processors obtain by changing their places and named by their own name, have an important place in the modal logic. Another important element in terms of modal logic and possible worlds semanticity is the "model" concept that shows which suggestions are correct in which possible world and conditions. When interpreted in monotonous and non-monotonous models, two modals that differ from the point of view of the barcan completeness, the increasing and decreasing individuals, can be achieved in unpredictable strange results. Although it is clear that with the development of the possible worlds semantics, the Barcan compliments are valid only under certain conditions; it has not been pointed out that interpretation in monotonous and non-monotonous models is problematic. Barcan compliments, which do not seem to be a problem from a semantic point of view, have metaphysical difficulties due to the unclear limits of what the objects of a possible world can contain, as well as the causes of the complexity of object-language and top-language uses. In this study, referring to the Barcan completeness and validity conditions with its main lines, the monotonous and non-monotonous models will include thoughts on the unpredictable metaphysical consequences of semantic interpretation and the causes of these consequences.