Combining Texts
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'Counterparts and Identity', 'Intro to 'Philosophy of Logic'' and 'Truth and Ontology'
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / a. Systems of modal logic
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Modal logic is multiple systems, shown in the variety of accessibility relations between worlds [Jacquette]
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4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
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To say there could have been people who don't exist, but deny those possible things, rejects Barcan [Stalnaker, by Rumfitt]
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