Abstract
A logic with normal modal operators and countable infinite conjunctions and disjunctions is introduced. A Hilbert's style axiomatization is proved complete for this logic, as well as for countable sublogics and subtheories. It is also shown that the logic has the interpolation property.
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Radev, S. Infinitary propositional normal modal logic. Stud Logica 46, 291–309 (1987). https://doi.org/10.1007/BF00370641
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DOI: https://doi.org/10.1007/BF00370641