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References to 'countably infinite'
1. aleph numbers by yark
2. atomic formula by CWoo
3. axiom of countable choice by yark
4. axiom of dependent choices by CWoo
5. Baer-Specker group by CWoo
6. beyond formalism: G\"{o}del's incompleteness by gribskoff
7. calculation of Riemann--Stieltjes integral by pahio
8. Cantor's diagonal argument by rmilson
9. cardinality of algebraic closure by rspuzio
10. continuous nowhere monotonic function by asteroid
11. countable algebraic sets by rspuzio
12. countably categorical structures by amador
13. cylindric algebra by CWoo
14. example of infinite simple group by rspuzio
15. fence by CWoo
16. finite complement topology by mathcam
17. first order language by CWoo
18. formal grammar by CWoo
19. free group by yark
20. Henri Poincar\'e by Daume
21. Hilbert parallelotope by rspuzio
22. IBN by CWoo
23. index of set theory by rspuzio
24. Kolmogorov's martingale inequality by stevecheng
25. many-sorted language by CWoo
26. oligomorphic permutation group by amador
27. PA by Henry
28. polynomials in algebraic systems by CWoo
29. product of posets by CWoo
30. proof of Hausdorff paradox by GrafZahl
31. proof of Polish spaces up to Borel isomorphism by gel
32. proof that countable unions are countable by Koro
33. pseudoparadox in measure theory by rspuzio
34. rigid by matte
35. signature by CWoo
36. solid set by CWoo
37. the Cartesian product of a finite number of countable sets is countable by BenB
38. union of countable sets by CWoo