Combining Philosophers

Ideas for James Rachels, Alex Orenstein and Ross P. Cameron

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2 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / g. System S4

15102

S4 says there must be some necessary truths (the actual ones, of which there is at least one) [Cameron]

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]