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'W.V. Quine', 'Modes of Extension: comment on Fine' and 'Intuitionism'
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4. Formal Logic / D. Modal Logic ML / 4. Alethic Modal Logic
8480
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S4: 'poss that poss that p' implies 'poss that p'; S5: 'poss that nec that p' implies 'nec that p' [Orenstein]
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