Ideas from 'On boundary numbers and domains of sets' by Ernst Zermelo [1930], by Theme Structure
[found in 'From Kant to Hilbert: sourcebook Vol. 2' (ed/tr Ewald,William) [OUP 1996,0-19-850536-1]].
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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 [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 [Maddy]
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5. Theory of Logic / L. Paradox / 3. Antinomies
17626
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The antinomy of endless advance and of completion is resolved in well-ordered transfinite numbers
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