Combining Texts
Ideas for
'fragments/reports', 'The Road to Serfdom' and 'What are Sets and What are they For?'
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7 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 / b. Empty (Null) Set
14239
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The empty set is usually derived from Separation, but it also seems to need Infinity [Oliver/Smiley]
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14240
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The empty set is something, not nothing! [Oliver/Smiley]
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14241
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We don't need the empty set to express non-existence, as there are other ways to do that [Oliver/Smiley]
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14242
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Maybe we can treat the empty set symbol as just meaning an empty term [Oliver/Smiley]
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / c. Unit (Singleton) Sets
14243
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The unit set may be needed to express intersections that leave a single member [Oliver/Smiley]
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