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References to 'Zorn's lemma'
1. $m$-system by CWoo
2. $p$-group by yark
3. affine geometry by CWoo
4. axiom of choice by GrafZahl
5. axiom of dependent choices by CWoo
6. Birkhoff prime ideal theorem by CWoo
7. criteria for a poset to be a complete lattice by CWoo
8. definition of prime ideal by Artin by pahio
9. equivalence of Hausdorff's maximum principle, Zorn's lemma and the well-ordering theorem by mathcam
10. equivalence of Kuratowski's lemma and Zorn's lemma by CWoo
11. equivalence of Zorn's lemma and the axiom of choice by Henry
12. every Hilbert space has an orthonormal basis by asteroid
13. every vector space has a basis by GrafZahl
14. example of injective module by Glotzfrosch
15. existence of maximal ideals by yark
16. existence of maximal subgroups by Algeboy
17. extension of a poset by CWoo
18. first-order theory by CWoo
19. functional analysis by PrimeFan
20. Hausdorff's maximum principle by CWoo
21. index of set theory by rspuzio
22. induction by Daume
23. lemma by mathcam
24. multiplicative sets in rings and prime ideals by joking
25. multiplicatively closed by CWoo
26. ordered tree by CWoo
27. ordering on cardinalities by CWoo
28. positive cone by CWoo
29. proof of every filter is contained in an ultrafilter (alternate proof) by brunoloff
30. proof of Hahn-Banach theorem by paolini
31. proof of Krein-Milman theorem by georgiosl
32. proof of the weak Nullstellensatz by pbruin
33. proof of Tukey's lemma by Koro
34. ramification of archimedean places by alozano
35. rings whose every module is free by joking
36. section filter by CWoo
37. Sikorski's extension theorem by CWoo
38. superset by yark
39. Zorn's lemma and bases for vector spaces by CWoo