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Canonical modal logics and ultrafilter extensions. (English) Zbl 0405.03011

##### MSC:
 03B45 Modal logic (including the logic of norms) 03C20 Ultraproducts and related constructions 03C60 Model-theoretic algebra
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##### References:
 [1] Filosofiska Studier (1971) [2] Algebra and Logic, Lecture Notes in Mathematics pp 163– (1975) [3] Reports on Mathematical Lotic 6 pp 41– (1976) [4] Theoria 40 pp 30– (1974) · Zbl 0287.02012 · doi:10.1111/j.1755-2567.1974.tb00077.x [5] Theoria 40 pp 23– (1974) · Zbl 0287.02011 · doi:10.1111/j.1755-2567.1974.tb00076.x [6] Modal formulas are either elementary or not $$\Sigma$$elementary 41 pp 436– (1976) · Zbl 0337.02015 [7] Proceedings of the Third Scandinavian Logic Symposium, Uppsala 1973 pp 15– (1975)
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