Combining Philosophers

Ideas for Dennis Whitcomb, Dale Jacquette and Bob Hale

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4 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / a. Systems of modal logic

9456	Modal logic is multiple systems, shown in the variety of accessibility relations between worlds [Jacquette]

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

7689	The modal logic of C.I.Lewis was only interpreted by Kripke and Hintikka in the 1960s [Jacquette]

4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula

19297

The two Barcan principles are easily proved in fairly basic modal logic [Hale]

19301

With a negative free logic, we can dispense with the Barcan formulae [Hale]