Combining Philosophers
Ideas for Gilles Deleuze, John Kekes and David M. Armstrong
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3 ideas
4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / g. System S4
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If what is actual might have been impossible, we need S4 modal logic [Armstrong, by Lewis]
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4. Formal Logic / F. Set Theory ST / 1. Set Theory
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The set theory brackets { } assert that the member is a unit [Armstrong]
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set
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For 'there is a class with no members' we don't need the null set as truthmaker [Armstrong]
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