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In this paper, we are going to analyze the phenomenon of modal incompleteness from an algebraic point of view. The usual method of showing that a given logic L is incomplete is to show that for some Σ $$ \subseteq $$ L and some $$\varphi \notin L,\varphi $$ cannot be separated from Σ by a suitably wide class of complete algebras — usually Kripke algebras. We are going to show that classical...
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