Combining Philosophers
Ideas for Anaxarchus, Timothy Williamson and J.O. Urmson
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7 ideas
4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5
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In S5 matters of possibility and necessity are non-contingent [Williamson]
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If metaphysical possibility is not a contingent matter, then S5 seems to suit it best [Williamson]
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4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
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If the domain of propositional quantification is constant, the Barcan formulas hold [Williamson]
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15130
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If a property is possible, there is something which can have it [Williamson]
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15139
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Converse Barcan: could something fail to meet a condition, if everything meets that condition? [Williamson]
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4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic
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Many-valued logics don't solve vagueness; its presence at the meta-level is ignored [Williamson]
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4. Formal Logic / E. Nonclassical Logics / 4. Fuzzy Logic
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Fuzzy logic uses a continuum of truth, but it implies contradictions [Williamson]
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