Combining Texts

Ideas for 'Difference and Repetition', 'W.V. Quine' and 'The Laws of Thought'

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4. Formal Logic / D. Modal Logic ML / 4. Alethic Modal Logic

8480	S4: 'poss that poss that p' implies 'poss that p'; S5: 'poss that nec that p' implies 'nec that p' [Orenstein]