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Ideas for 'fragments/reports', 'Mathematics without Numbers' and 'Letters to Frege'

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4 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 / L. Paradox / 5. Paradoxes in Set Theory / d. Russell's paradox

13365

Russell's Paradox is a stripped-down version of Cantor's Paradox [Priest,G on Russell]

10711

Russell's paradox means we cannot assume that every property is collectivizing [Potter on Russell]