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'Parmenides', 'On Female Body Experience' and 'Intro: Theories of Vagueness'
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5
9065
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S5 collapses iterated modalities (◊□P→□P, and ◊◊P→◊P) [Keefe/Smith]
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