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Ideas for 'fragments/reports', 'Thinking About Logic' and 'Principia Mathematica'

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4 ideas

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / p. Axiom of Reducibility

21720

Russell saw Reducibility as legitimate for reducing classes to logic [Linsky,B on Russell/Whitehead]

4. Formal Logic / F. Set Theory ST / 5. Conceptions of Set / c. Logical sets

11020

Realisms like the full Comprehension Principle, that all good concepts determine sets [Read]

4. Formal Logic / F. Set Theory ST / 8. Critique of Set Theory

10044

Russell denies extensional sets, because the null can't be a collection, and the singleton is just its element [Russell/Whitehead, by Shapiro]

18208

We regard classes as mere symbolic or linguistic conveniences [Russell/Whitehead]