The language of propositional modal logic is extended by the introduction of sequents. Validity of a modal sequent on a frame is defined, and modal sequent-axiomatic classes of frames are introduced.
This is part I of a two-part essay introducing case-intensional first order logic (CIFOL), an easy-to-use, uniform, powerful, and useful combination of first-order logic with modal logic resulting ...
An introduction to modal and many-valued logics, with emphasis on philosophical motivation through a study of applications and paradoxes. Reading: PP, selections from Chs. 11-12.
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