Notes on neighborhood semantics for logics of unknown truths and false beliefs

• URL: http://arxiv.org/abs/2002.09622v1
• Date: Sat, 22 Feb 2020 04:27:04 GMT
• Title: Notes on neighborhood semantics for logics of unknown truths and false beliefs
• Authors: Jie Fan
• Abstract summary: We study logics of unknown truths and false beliefs under neighborhood semantics. It turns out that they are incomparable over various classes of neighborhood models. We extend the results to the case of public announcements.
• Score: 1.827510863075184
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In this article, we study logics of unknown truths and false beliefs under neighborhood semantics. We compare the relative expressivity of the two logics. It turns out that they are incomparable over various classes of neighborhood models, and the combination of the two logics are equally expressive as standard modal logic over any class of neighborhood models. We propose morphisms for each logic, which can help us explore the frame definability problem, show a general soundness and completeness result, and generalize some results in the literature. We axiomatize the two logics over various classes of neighborhood frames. Last but not least, we extend the results to the case of public announcements, which has good applications to Moore sentences and some others.

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