Combining Philosophers
Ideas for Samuel Alexander, Robert C. Stalnaker and Michel Foucault
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / a. Systems of modal logic
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Non-S5 can talk of contingent or necessary necessities [Stalnaker]
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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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