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Combining Philosophers
Ideas for Herodotus, Bob Hale and George Dickie
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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]