Modal Frame Correspondences and Fixed-Points

Studia Logica 83 (1-3):133-155 (2006)

Abstract

Taking Löb's Axiom in modal provability logic as a running thread, we discuss some general methods for extending modal frame correspondences, mainly by adding fixed-point operators to modal languages as well as their correspondence languages. Our suggestions are backed up by some new results – while we also refer to relevant work by earlier authors. But our main aim is advertizing the perspective, showing how modal languages with fixed-point operators are a natural medium to work with.

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Johan Van Benthem
University of Amsterdam

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