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    Uncompactness entails failure of strong completeness but ... — Carmelics
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    Challenges→PDL's calculus is sound and complete only in the weak sense.

    Uncompactness entails failure of strong completeness but leaves weak completeness fully intact, so the two properties operate at distinct levels of logical strength.

    ?Rate how convincing each reason is below to see the overall strength.

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    PDL's calculus is sound and complete only in the weak sense.

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