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'poems', 'The Intentional Fallacy' and 'On boundary numbers and domains of sets'
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2 ideas
4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets
17832
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Zermelo showed that the ZF axioms in 1930 were non-categorical [Zermelo, by Hallett,M]
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / h. Axiom of Replacement VII
13028
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Replacement was added when some advanced theorems seemed to need it [Zermelo, by Maddy]
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