Abstract
Dealing with topics of definability, this paper provides some interesting insights into the expressive power of basic modal logic. After some preliminary work it presents an abstract algebraic characterization of the elementary classes of basic modal logic, that is, of the classes of models that are definable by means of (sets of) basic modal formulas. Taking that for a start, the paper further contains characterization results for modal universal classes and modal positive classes.
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Sturm, H. Elementary Classes in Basic Modal Logic. Studia Logica 64, 193–213 (2000). https://doi.org/10.1023/A:1005233530449
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DOI: https://doi.org/10.1023/A:1005233530449