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2 ideas
4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / a. Systems of modal logic
16468
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Non-S5 can talk of contingent or necessary necessities [Stalnaker]
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / b. Axiom of Extensionality I
16449
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In modal set theory, sets only exist in a possible world if that world contains all of its members [Stalnaker]
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