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'Mathematical Methods in Philosophy', 'New Foundations for Mathematical Logic' 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
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S5 collapses iterated modalities (◊□P→□P, and ◊◊P→◊P) [Keefe/Smith]
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets
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NF has no models, but just blocks the comprehension axiom, to avoid contradictions [Quine, by Dummett]
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