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A note on logics of essence and accident. (English) Zbl 1477.03051

Summary: In this paper, we examine the logics of essence and accident and attempt to ascertain the extent to which those logics are genuinely formalizing the concepts in which we are interested. We suggest that they are not completely successful as they stand. We diagnose some of the problems and make a suggestion for improvement. We also discuss some issues concerning definability in the formal language.

MSC:

03B45 Modal logic (including the logic of norms)
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