Mathematics – Logic
Scientific paper
2012-02-15
Bulletin of the Section of Logic 39:3-4, pp. 199-204, 2010
Mathematics
Logic
4 pages
Scientific paper
Thomason \cite{Thomason74} showed that a certain modal logic $\mathbf{L}\subset \mathbf{S4}$ is incomplete with respect to Kripke semantics. Later Gerson \cite{Gerson75} showed that $\mathbf{L}$ is also incomplete with respect to neighborhood semantics. In this paper we show that $\mathbf{L}$ is in fact incomplete with respect to any class of complete Boolean algebras with operators, i.e. that it is completely incomplete.
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