Combining Texts

Ideas for 'Commentary on 'De Anima'', 'Nature's Metaphysics' and 'Intro: Theories of Vagueness'

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2 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5

9065	S5 collapses iterated modalities (◊□P→□P, and ◊◊P→◊P) [Keefe/Smith]

4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula

9449	The plausible Barcan formula implies modality in the actual world [Bird]