Combining Philosophers

Ideas for Prodicus, Cappelen,H/Dever,J and Bob Hale

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2 ideas

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]