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References to 'ordinal number'
1. additively indecomposable by mathcam
2. aleph numbers by yark
3. ascending series by yark
4. axiom of infinity by Sabean
5. beth numbers by yark
6. Bourbaki, Nicolas by Daume
7. Burali-Forti paradox by Henry
8. canonical ordering on pairs of ordinals by CWoo
9. Cantor normal form by rspuzio
10. Cantor-Bendixson derivative by CWoo
11. cardinal number by djao
12. category isomorphism by CWoo
13. classes of ordinals and enumerating functions by mathcam
14. constructing well ordered sets by CWoo
15. descending series by yark
16. equivalence of Zorn's lemma and the axiom of choice by Henry
17. example of transfinite induction by CWoo
18. fixed points of normal functions by Henry
19. forcing by ratboy
20. from Hilbert's tenth problem to G\"{o}del's trichotomy by gribskoff
21. FS iterated forcing preserves chain condition by Henry
22. generalized continuum hypothesis by yark
23. Hartogs number by CWoo
24. idempotency of infinite cardinals by CWoo
25. index of set theory by rspuzio
26. intuitionistic logic by gribskoff
27. Levy collapse by ratboy
28. motivation for von Neumann ordinals by yark
29. ordering on cardinalities by CWoo
30. ordinal arithmetic by Henry
31. ordinal exponentiation by CWoo
32. ordinal space by CWoo
33. proof of $\Diamond$ is equivalent to $\clubsuit$ and continuum hypothesis by Henry
34. proof of complete partial orders do not add small subsets by Henry
35. proof of principle of transfinite induction by jihemme
36. properties of ordinal arithmetic by CWoo
37. properties of ordinals by CWoo
38. properties of ranks of sets by CWoo
39. sequence by djao
40. set by Mathprof
41. transfinite derived series by yark
42. transfinite induction by jihemme
43. tree (set theoretic) by Henry
44. Veblen function by Henry
45. von Neumann-Bernays-G\"odel set theory by Aatu
46. words for numbers in Slavic languages by PrimeFan