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'Purifications (frags)', 'Necessary Beings' and 'Knowledge by Acquaintance and Description-1'
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4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
19297
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The two Barcan principles are easily proved in fairly basic modal logic [Hale]
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19301
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With a negative free logic, we can dispense with the Barcan formulae [Hale]
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