Combining Texts

Ideas for 'On the Philosophy of Logic', 'Truthmakers and Converse Barcan Formula' and 'The philosophical basis of intuitionist logic'

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6 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5

15131

If metaphysical possibility is not a contingent matter, then S5 seems to suit it best [Williamson]

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

15135

If the domain of propositional quantification is constant, the Barcan formulas hold [Williamson]

15139

Converse Barcan: could something fail to meet a condition, if everything meets that condition? [Williamson]

4. Formal Logic / E. Nonclassical Logics / 2. Intuitionist Logic

18073

Dummett says classical logic rests on meaning as truth, while intuitionist logic rests on assertability [Dummett, by Kitcher]

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

8943	Three-valued logic says excluded middle and non-contradition are not tautologies [Fisher]

4. Formal Logic / E. Nonclassical Logics / 4. Fuzzy Logic

8945	Fuzzy logic has many truth values, ranging in fractions from 0 to 1 [Fisher]