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'fragments/reports', 'works' and 'Quaestiones de anima'
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5 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 / 1. Set Theory
13455
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Frege did not think of himself as working with sets [Frege, by Hart,WD]
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set
16895
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The null set is indefensible, because it collects nothing [Frege, by Burge]
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4. Formal Logic / F. Set Theory ST / 5. Conceptions of Set / c. Logical sets
3328
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Frege proposed a realist concept of a set, as the extension of a predicate or concept or function [Frege, by Benardete,JA]
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