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  1. Weisstein, Eric W.  (.) Wolfram MathWorld.
  2. Unsolved Problem 26: Given a simple closed curve in the plane, can we always find four points on this curve that are the vertices of a square? Unsolved Problem of the Week. MathPro Press.
  3. Weisstein, Eric W. Square Inscribing (.) Wolfram MathWorld.
  4. Unsolved Problem 33: Is there a constant, A, such that any set in the plane of area A must contain the vertices of a triangle with area 1? Unsolved Problem of the Week. MathPro Press.
  5. 1 2 . III // .  , 1964.
  6. Unsolved Problem 22: Is there a triangle with integer sides, medians, and area? Unsolved Problem of the Week. MathPro Press.
  7. 1 2 Weisstein, Eric W. Rational Distance Problem (.) Wolfram MathWorld.
  8. Unsolved Problem 13: Is there a point in the plane that is at a rational distance from each of the four corners of a unit square? Unsolved Problem of the Week. MathPro Press.
  9. Weisstein, Eric W. Shephard's Conjecture (.) Wolfram MathWorld.
  10. Weisstein, Eric W. Tetrahedron Circumscribing (.) Wolfram MathWorld.
  11. Unsolved Problem 23: How should you locate 13 cities on a spherical planet so that the minimum distance between any two of them is as large as possible?Unsolved Problem of the Week. MathPro Press.
  12. Decomposing the 2-Sphere into Domains of Smallest Possible Diameter
  13. Noga Alon (.), Discrete mathematics: methods and challenges
  14. Pixel Counting, Mu-Ency at MROB
  15. Weisstein, Eric W. Illumination Problem (.) Wolfram MathWorld.
  16. Integer distances
  17. Tobias Kreisel, Sascha Kurz, There are integral heptagons, no three points on a line, no four on a circle
  18. Erich Friedman, Unsolved Problems in Planar Geometry
  19. . . VII. // / . . . . . .  . 2, .  .: , 1976.  . 49.  167 .
  20. Bonnesen T., Fenchel W. Theorie der konvexen Körper.  Berlin: Verlag von Julius Springer, 1934.  S. 127139.  (Ergebnisse der Mathematik und ihrer Grenzgebiete, Band 3, Heft 1).  (.)
  21. Kawohl B. Convex Sets of Constant Width  (.) // Oberwolfach Reports. Zurich: European Mathematical Society Publishing House, 2009. Vol. 6. № 1. P. 390393.
  22. Anciaux H., Guilfoyle B. On the Three-Dimensional Blaschke-Lebesgue Problem  (.) // Proceedings of the American Mathematical Society. Providence: American Mathematical Society, 2011. Vol. 139. № 5. P. 18311839. ISSN 0002-9939. DOI:10.1090/S0002-9939-2010-10588-9 arΧiv:0906.3217
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  24. 1 2 Weisstein, Eric W. Circle Packing (.) Wolfram MathWorld.
  25. Weisstein, Eric W.  (.) Wolfram MathWorld.
  26. Weisstein, Eric W.  (.) Wolfram MathWorld.
  27. Weisstein, Eric W. Keller's Conjecture (.) Wolfram MathWorld.
  28. R. Grigorchuk, I. Pak Groups of Intermediate Growth: an Introduction for Beginners arXiv
  29. Sharipov, R.A. (2009), "Transfinite normal and composition series of groups", arΧiv:0908.2257 [math.GR] 
  30. ( ) / . . . , . . , . . .  4 .  : , 1973.
  31. . / . . . , . . .  17 . .  : , 2010.  219 .
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  33. Weisstein, Eric W. 2 (.) Wolfram MathWorld.
  34. Weisstein, Eric W. Flint Hills Series (.) Wolfram MathWorld.
  35. Weisstein, Eric W.  (.) Wolfram MathWorld.
  36. Weisstein, Eric W. Pi (.) Wolfram MathWorld.
  37. Weisstein, Eric W. e (.) Wolfram MathWorld.
  38. en:Irrational number#Open questions
  39. Some unsolved problems in number theory
  40. Weisstein, Eric W.  (.) Wolfram MathWorld.
  41. An introduction to irrationality and transcendence methods
  42. Weisstein, Eric W. Measure.html  (.) Wolfram MathWorld.
  43. Weisstein, Eric W.  (.) Wolfram MathWorld.
  44. Caccetta-H�ggkvist Conjecture (1978)
  45. Adams, Colin (2004), The Knot Book: An Elementary Introduction to the Mathematical Theory of Knots, American Mathematical Society, ISBN 0821836781
  46. Yuri Matiyasevich, Hilberts Tenth Problem: What was done and what is to be done
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  48. When is a pair of matrices mortal?
  49. Weisstein, Eric W.  (.) Wolfram MathWorld.
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  51. A028444 OEIS
  52. Transfinite Ordinals and Their Notations
  53. http://www.ams.org/journals/tran/1984-286-01/S0002-9947-1984-0756043-7/S0002-9947-1984-0756043-7.pdf
  54. Skolem + Tetration Is Well-Ordered
  55. The Ordinal of Skolem + Tetration Is τ0
  56. Cardinal And Ordinal Numbers.  : Polish Scientific Publishers, 1965.  (.)
  57. WolframScience Conference NKS2006
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