Logical modality includes logical necessity and logical possibility, while epistemic modality includes epistemic necessity and epistemic possibility. But when I read the explanation of these concepts in the book of Kearn (2011), I feel really confused. Can you explain them with 1~2 simple sentences or examples to distinguish them? Thank you in advance!

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    The phrase "logical modality" does not contrast with "epistemic modality" (except possibly in Kearn's book, which I have not read). Normally the distinction in logic about types of modality is between Epistemic modality, which is about logic and probability (This may not be the place; She must be home by now), as opposed to Deontic modality, which is about social permission and obligation (He may not enter if he's armed; She must be home by midnight).
    – jlawler
    Commented Sep 11, 2020 at 17:32
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    @jlawler Yes, in the book, it said "Epistemic possibility includes logical possibility", but there is no explicit illustration about the relationship of epistemic necessity and logical necessity, which baffled me a lot till now. But anyway, thank you for your explanation!
    – ronghe
    Commented Sep 13, 2020 at 11:39


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