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  1. Simplified Kripke Style Semantics for Some Very Weak Modal Logics.Andrzej Pietruszczak - 2009 - Logic and Logical Philosophy 18 (3-4):271-296.
    In the present paper we examine very weak modal logics C1, D1, E1, S0.5◦, S0.5◦+(D), S0.5 and some of their versions which are closed under replacement of tautological equivalents (rte-versions). We give semantics for these logics, formulated by means of Kripke style models of the form , where w is a «distinguished» world, A is a set of worlds which are alternatives to w, and V is a valuation which for formulae and worlds assigns the truth-vales such that: (i) for (...)
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