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'fragments/reports', 'Set Theory and related topics (2nd ed)' and 'Db (chronology)'
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3 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
20791
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Chrysippus has five obvious 'indemonstrables' of reasoning [Chrysippus, by Diog. Laertius]
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / e. Equivalence classes
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Equivalence relations are reflexive, symmetric and transitive, and classify similar objects [Lipschutz]
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