Journal of Philosophical Logic 48 (2):425-445 (2019)

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Abstract
Contingency and accident are two important notions in philosophy and philosophical logic. Their meanings are so close that they are mixed up sometimes, in both daily life and academic research. This indicates that it is necessary to study them in a unified framework. However, there has been no logical research on them together. In this paper, we propose a language of a bimodal logic with these two concepts, investigate its model-theoretical properties such as expressivity and frame definability. We axiomatize this logic over various classes of frames, whose completeness proofs are shown with the help of a crucial schema. The interactions between contingency and accident can sharpen our understanding of both notions. Then we extend the logic to a dynamic case: public announcements. By finding the required reduction axioms, we obtain a complete axiomatization, which gives us a good application to Moore sentences.
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DOI 10.1007/s10992-018-9470-5
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References found in this work BETA

A Reply to My Critics.George Edward Moore - 1942 - In Paul Arthur Schilpp (ed.), The Philosophy of G. E. Moore. Open Court.
A Logical Analysis of Some Value Concepts.Frederic Fitch - 1963 - Journal of Symbolic Logic 28 (2):135-142.

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Citations of this work BETA

Logics of (In)Sane and (Un)Reliable Beliefs.Jie Fan - 2022 - Logic Journal of the IGPL 30 (1):78-100.
A Unified Logic for Contingency and Accident.Jie Fan - 2022 - Journal of Philosophical Logic 51 (4):693-720.
A Logic for Disjunctive Ignorance.Jie Fan - 2021 - Journal of Philosophical Logic 50 (6):1293-1312.

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