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'fragments/reports', 'Contributions to Philosophy' and 'Philosophy of Mathematics'
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7 ideas
4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic
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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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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 / d. Infinite Sets
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9634
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Set theory says that natural numbers are an actual infinity (to accommodate their powerset) [Brown,JR]
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4. Formal Logic / F. Set Theory ST / 5. Conceptions of Set / d. Naïve logical sets
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9613
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Naïve set theory assumed that there is a set for every condition [Brown,JR]
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9615
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Nowadays conditions are only defined on existing sets [Brown,JR]
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4. Formal Logic / F. Set Theory ST / 5. Conceptions of Set / e. Iterative sets
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9617
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The 'iterative' view says sets start with the empty set and build up [Brown,JR]
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4. Formal Logic / F. Set Theory ST / 7. Natural Sets
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9642
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A flock of birds is not a set, because a set cannot go anywhere [Brown,JR]
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