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References to 'open question'
1. $\Omega$-stability theorem by Koro
2. ABC conjecture by yark
3. Agoh-Giuga conjecture by PrimeFan
4. Alexander Grothendieck by PrimeFan
5. Alexander Grothendieck's biography and his major mathematical contributions by bci1
6. Andrica's conjecture by PrimeFan
7. Anosov diffeomorphism by Koro
8. Artin's conjecture on primitive roots by alozano
9. Beal conjecture by mathcam
10. Birch and Swinnerton-Dyer conjecture by alozano
11. bounded inverse theorem by asteroid
12. Brauer's ovals theorem by Andrea Ambrosio
13. Brocard's conjecture by PrimeFan
14. Cantor set by yark
15. Catalan's conjecture by pahio
16. chaotic dynamical system by bshanks
17. characterization of maximal ideals of the algebra of continuous functions on a compact set by rspuzio
18. Chen's theorem by PrimeFan
19. colorings of plane graphs by marijke
20. comparison between Lebesgue and Riemann Integration by Mathprof
21. conjecture on fractions with odd denominators by drini
22. convexity conjecture by PrimeFan
23. covering system by PrimeFan
24. cryptography and number theory by archibal
25. Cullen prime by PrimeFan
26. derivation language by CWoo
27. DNA inequality by PrimeFan
28. enumerating groups by Algeboy
29. equitable matrix for money exchange by mathforever
30. Erd\H{o}s-Straus conjecture by CompositeFan
31. Erd\H{o}s-Turan conjecture by bbukh
32. Euler's conjecture by PrimeFan
33. example of four exponentials conjecture by archibal
34. examples of aliquot sequences by PrimeFan
35. examples supporting the Erd\H{o}s-Straus conjecture by PrimeFan
36. famous open questions in mathematics by rspuzio
37. Feit-Thompson conjecture by PrimeFan
38. Fermat numbers by drini
39. Fermat's last theorem by akrowne
40. finite projective plane by Mathprof
41. Fortune's conjecture by PrimeFan
42. four exponentials conjecture by Kevin OBryant
43. four hundred ninety-six by CompositeFan
44. four-color conjecture by bbukh
45. full reptend prime by PrimeFan
46. functional analysis by PrimeFan
47. generalized Andrica conjecture by dankomed
48. Goldbach's conjecture by drini
49. Goormaghtigh conjecture by mathcam
50. graph minor theorem by AxelBoldt
51. groupoid C*-convolution algebras by bci1
52. groupoid representation theorem by bci1
53. halting problem by rspuzio
54. Henri Poincar\'e by Daume
55. hyperk\"ahler manifold by tiphareth
56. hypothesis by PrimeFan
57. idempotent classifications by Algeboy
58. intrinsically knotted by YourInnerNurmo
59. intrinsically linked by YourInnerNurmo
60. invariant subspace problem by asteroid
61. Kahun Papyrus and Arithmetic Progressions by milogardner
62. Kneser graphs by justice
63. Kolakoski sequence by PrimeFan
64. Kronecker's Jugendtraum by mathcam
65. Krystyna Kuperberg by Mravinci
66. Landau notation by Mathprof
67. Landau's problems by PrimeFan
68. Laurent Lafforgue by PrimeFan
69. lecture notes on the Cayley-Hamilton theorem by rmilson
70. Legendre's conjecture by PrimeFan
71. Levy's conjecture by PrimeFan
72. Lindemann-Weierstrass theorem by CWoo
73. linear bounded automaton by CWoo
74. local minimum of convex function is necessarily global by stevecheng
75. local Nagano theorem by jirka
76. L\"ob's theorem by dankomed
77. Marshall Hall's conjecture by PrimeFan
78. mathematics vocabulary by matte
79. Michael Francis Atiyah by bci1
80. Millennium Problems by Mravinci
81. model theory by mps
82. Moore graph by Mathprof
83. normal number by AxelBoldt
84. number theory by olivierfouquetx
85. Order Conjecture for non-commuting graph of a group by abdollahi
86. Poincar\'e conjecture by yark
87. Poincar\'e dodecahedral space by Mathprof
88. Pollard's $\rho$ by yark
89. polynomial function is a proper map by joking
90. prime number theorem by bbukh
91. prime quadruplet conjecture by PrimeFan
92. proof of closed differential forms on a simple connected domain by paolini
93. proof of Scott-Wiegold conjecture by whm22
94. P\'olya's conjecture by PrimeFan
95. quantum automata and computation by bci1
96. quantum field state on the tetrahedron by bci1
97. Ramanujan tau function by Wkbj79
98. Ramsey's theorem by bbukh
99. Redmond-Sun conjecture by PrimeFan
100. Robert Rosen by bci1
101. Schanuel's conjecture by mathcam
102. Schinzel's Hypothesis H by jtolliver
103. Scott-Wiegold conjecture by whm22
104. semicontinuous by bwebste
105. Sikorski's extension theorem by CWoo
106. Singmaster's conjecture by PrimeFan
107. six exponentials theorem by Kevin OBryant
108. Sloane's conjecture on multiplicative digital root by CompositeFan
109. small integers that are or might be the largest of their kind by Mravinci
110. square root of 5 by MathNerd
111. star height by CWoo
112. Stephen William Hawking by bci1
113. Stern prime by PrimeFan
114. submanifold by jirka
115. Sun's conjecture on sums of primes and triangular numbers by PrimeFan
116. temporary index 3 of number theory topics by PrimeFan
117. theory of rational and irrational numbers by alozano
118. Thurston's geometrization conjecture by PrimeFan
119. tight by mps
120. top ten coolest numbers by rspuzio
121. topic on the algebraic foundations of quantum algebraic topology by bci1
122. topological vector space by yark
123. transcendence degree by mathcam
124. twin prime conjecture by alozano
125. uniqueness conjecture for Markov numbers by PrimeFan
126. Van der Waerden's permanent conjecture by marijke
127. Vandiver's conjecture by mathcam
128. Vizing's theorem by marijke
129. Waring's problem by bbukh
130. wavelet set by swiftset
131. Weil conjectures by nerdy2
132. Wieferich prime by mathcam
133. world records in mathematics by PrimeFan
134. \'etale fundamental group by archibal
135. \'Evariste Galois by MathNerd