Combining Texts

Ideas for 'Mahaprajnaparamitashastra', 'Necessary Beings' and 'Vagueness'

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3 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]

4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic

21602

Many-valued logics don't solve vagueness; its presence at the meta-level is ignored [Williamson]