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Ideas for 'Philosophy of Mathematics', 'Necessary Beings' and 'The Ethical Criticism of Art'

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3 ideas

4. Formal Logic / D. Modal Logic ML / 1. Modal Logic

10206

Modal operators are usually treated as quantifiers [Shapiro]

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

19301

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

19297

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