Combining Texts
Ideas for
'Unconscious Cerebral Initiative', 'Thinking About Logic' and 'Truthmakers and Converse Barcan Formula'
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8 ideas
4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / c. Derivation rules of PL
10987
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Three traditional names of rules are 'Simplification', 'Addition' and 'Disjunctive Syllogism' [Read]
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / a. Systems of modal logic
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Necessity is provability in S4, and true in all worlds in S5 [Read]
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5
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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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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 / 4. Fuzzy Logic
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There are fuzzy predicates (and sets), and fuzzy quantifiers and modifiers [Read]
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4. Formal Logic / E. Nonclassical Logics / 6. Free Logic
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Same say there are positive, negative and neuter free logics [Read]
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4. Formal Logic / F. Set Theory ST / 5. Conceptions of Set / c. Logical sets
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Realisms like the full Comprehension Principle, that all good concepts determine sets [Read]
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