Combining Texts

Ideas for 'fragments/reports', 'A Serious Proposal to the Ladies I' and 'What are Sets and What are they For?'

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5 ideas

5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens

8078	Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]

5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle

6023	Every proposition is either true or false [Chrysippus, by Cicero]

5. Theory of Logic / G. Quantification / 6. Plural Quantification

14234

If you only refer to objects one at a time, you need sets in order to refer to a plurality [Oliver/Smiley]

14237

We can use plural language to refer to the set theory domain, to avoid calling it a 'set' [Oliver/Smiley]

5. Theory of Logic / I. Semantics of Logic / 3. Logical Truth

14245

Logical truths are true no matter what exists - but predicate calculus insists that something exists [Oliver/Smiley]