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References to 'equivalence class'
1. $L^1(G)$ is a Banach *-algebra by asteroid
2. $L^2$-spaces are Hilbert spaces by asteroid
3. $L^{\infty}(X, \mu)$ by ack
4. $p$-adic integers by djao
5. ${\mathbb{Z}}_n$ by Wkbj79
6. (closed) walk / trek / trail / path by marijke
7. abelian group by yark
8. algebraic categories and classes of algebras by bci1
9. algebraic geometry by archibal
10. Algebraic K-theory by mhale
11. alternative definition of cardinality by CWoo
12. an integral domain is lcm iff it is gcd by CWoo
13. angle by CWoo
14. categorical algebra by bci1
15. category of paths on a graph by rspuzio
16. class structure by CWoo
17. commensurable numbers by pahio
18. compact quantum groupoids related to C*-algebras by bci1
19. concepts in set theory by matte
20. conditional expectation by georgiosl
21. congruence by rspuzio
22. congruence in algebraic number field by pahio
23. conjugacy class by drini
24. conjugacy class by djao
25. connected category by CWoo
26. connected component by djao
27. constructing automata from regular languages by CWoo
28. construction of Riemann surface using paths by rspuzio
29. correspondence of normal subgroups and group congruences by Dr_Absentius
30. curve by rmilson
31. diamond lemma by CWoo
32. Einstein field equations by rspuzio
33. equivalent machines by CWoo
34. examples of groups by AxelBoldt
35. Ext by mathcam
36. forcing by ratboy
37. formal power series as inverse limits by rspuzio
38. free group by yark
39. Freiman isomorphism by bbukh
40. functor category by CWoo
41. homotopy category by bci1
42. homotopy double groupoid of a Hausdorff space by bci1
43. hyperreal by djao
44. ideal class by mathcam
45. ideal norm by pahio
46. imaginaries by mathcam
47. implications of having divisor theory by pahio
48. index of set theory by rspuzio
49. integer by CWoo
50. integral binary quadratic forms by rm50
51. intercession by WM
52. isomorphism of the group PSL_2(C) with the group of M\"obius transformations by rspuzio
53. Leech lattice by monster
54. Lindenbaum-Tarski algebra by CWoo
55. localization by djao
56. logical graph : introduction by Jon Awbrey
57. logicism by gribskoff
58. models constructed from constants by ratboy
59. notes on the classical definition of a manifold by rmilson
60. parallellism in Euclidean plane by pahio
61. partition by Wkbj79
62. projective line configurations by rspuzio
63. projective plane by yark
64. proof that $n^2-n+41$ is prime for $0\leq n\leq 40$ by rm50
65. quasicomponent by Evandar
66. quotient category by CWoo
67. quotient group by azdbacks4234
68. quotient ring by mathwizard
69. quotient space by djao
70. realization of a formula by a truth function by CWoo
71. reduced automaton by CWoo
72. regular conditional probability by CWoo
73. semiotic equivalence relation by Jon Awbrey
74. similar matrix by Wkbj79
75. simple algebraic system by CWoo
76. simultaneous block-diagonalization of upper triangular commuting matrices by lars_h
77. skeleton by CWoo
78. space curve by Mathprof
79. submanifold by jirka
80. suspension by antonio
81. Thue system by CWoo
82. weak Hopf C*-algebra by bci1
83. well-defined by pahio