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'fragments/reports', 'The Barcan Formula and Metaphysics' and 'The Theory of Objects'
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6 ideas
4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic
8077
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Stoic propositional logic is like chemistry - how atoms make molecules, not the innards of atoms [Chrysippus, by Devlin]
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4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / e. Axioms of PL
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Chrysippus has five obvious 'indemonstrables' of reasoning [Chrysippus, by Diog. Laertius]
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4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
16186
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The Barcan Formulas express how to combine modal operators with classical quantifiers [Simchen]
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16187
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The Barcan Formulas are orthodox, but clash with the attractive Actualist view [Simchen]
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16190
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BF implies that if W possibly had a child, then something is possibly W's child [Simchen]
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4. Formal Logic / E. Nonclassical Logics / 6. Free Logic
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So-called 'free logic' operates without existence assumptions [Meinong, by George/Van Evra]
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