This is a preview. Log in through your library . Abstract Modal logic has been applied in many different areas, as reasoning about time, knowledge and belief, necessity and possibility, to mention ...

The study of epistemic logic, which formalises the reasoning about knowledge and belief, has been enriched by recent incorporations of topological semantics. This interdisciplinary approach leverages ...

A simple, bivalent semantics is defined for Łukasiewicz's 4-valued modal logic Łm4. It is shown that according to this semantics, the essential presupposition underlying Łm4 is the following: A is a ...