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References to 'transfinite recursion'
1. aleph numbers by yark
2. classes of ordinals and enumerating functions by mathcam
3. cumulative hierarchy by yark
4. equivalence of Hausdorff's maximum principle, Zorn's lemma and the well-ordering theorem by mathcam
5. proof of Zermelo's well-ordering theorem by Henry
6. von Neumann ordinal by Henry
7. well-founded recursion by CWoo