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- Weisstein, Eric W. (.) Wolfram MathWorld.
- 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.
- Weisstein, Eric W. Square Inscribing (.) Wolfram MathWorld.
- 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.
- 1 2 . III // . , 1964.
- Unsolved Problem 22: Is there a triangle with integer sides, medians, and area? Unsolved Problem of the Week. MathPro Press.
- 1 2 Weisstein, Eric W. Rational Distance Problem (.) Wolfram MathWorld.
- 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.
- Weisstein, Eric W. Shephard's Conjecture (.) Wolfram MathWorld.
- Weisstein, Eric W. Tetrahedron Circumscribing (.) Wolfram MathWorld.
- 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.
- Decomposing the 2-Sphere into Domains of Smallest Possible Diameter
- Noga Alon (.), Discrete mathematics: methods and challenges
- Pixel Counting, Mu-Ency at MROB
- Weisstein, Eric W. Illumination Problem (.) Wolfram MathWorld.
- Integer distances
- Tobias Kreisel, Sascha Kurz, There are integral heptagons, no three points on a line, no four on a circle
- Erich Friedman, Unsolved Problems in Planar Geometry
- . . VII. // / . . . . . . . 2, . .: , 1976. . 49. 167 .
- 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). (.)
- Kawohl B. Convex Sets of Constant Width (.) // Oberwolfach Reports. Zurich: European Mathematical Society Publishing House, 2009. Vol. 6. № 1. P. 390393.
- 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
- Packing Equal Circles on a Sphere
- 1 2 Weisstein, Eric W. Circle Packing (.) Wolfram MathWorld.
- Weisstein, Eric W. (.) Wolfram MathWorld.
- Weisstein, Eric W. (.) Wolfram MathWorld.
- Weisstein, Eric W. Keller's Conjecture (.) Wolfram MathWorld.
- R. Grigorchuk, I. Pak Groups of Intermediate Growth: an Introduction for Beginners arXiv
- Sharipov, R.A. (2009), "Transfinite normal and composition series of groups", arΧiv:0908.2257 [math.GR]
- ( ) / . . . , . . , . . . 4 . : , 1973.
- . / . . . , . . . 17 . . : , 2010. 219 .
- . / . . . , . . , . . . 4- . : , 1993. 73 .
- Weisstein, Eric W. 2 (.) Wolfram MathWorld.
- Weisstein, Eric W. Flint Hills Series (.) Wolfram MathWorld.
- Weisstein, Eric W. (.) Wolfram MathWorld.
- Weisstein, Eric W. Pi (.) Wolfram MathWorld.
- Weisstein, Eric W. e (.) Wolfram MathWorld.
- en:Irrational number#Open questions
- Some unsolved problems in number theory
- Weisstein, Eric W. (.) Wolfram MathWorld.
- An introduction to irrationality and transcendence methods
- Weisstein, Eric W. Measure.html (.) Wolfram MathWorld.
- Weisstein, Eric W. (.) Wolfram MathWorld.
- Caccetta-H�ggkvist Conjecture (1978)
- Adams, Colin (2004), The Knot Book: An Elementary Introduction to the Mathematical Theory of Knots, American Mathematical Society, ISBN 0821836781
- Yuri Matiyasevich, Hilberts Tenth Problem: What was done and what is to be done
- . . . , 1993.
- When is a pair of matrices mortal?
- Weisstein, Eric W. (.) Wolfram MathWorld.
- . . . , . ., 2003.
- A028444 OEIS
- Transfinite Ordinals and Their Notations
- http://www.ams.org/journals/tran/1984-286-01/S0002-9947-1984-0756043-7/S0002-9947-1984-0756043-7.pdf
- Skolem + Tetration Is Well-Ordered
- The Ordinal of Skolem + Tetration Is τ0
- Cardinal And Ordinal Numbers. : Polish Scientific Publishers, 1965. (.)
- WolframScience Conference NKS2006
- . . . ., .: " ", 2001, 320 ., . 1000 ., ISBN 5-8360-0192-8, . 1 " ", 1.4 " ", 1.4 " ", . 29
[]
- Open Problem Garden (.)
- Open Questions: Mathematics (.)
- The Open Problems Project (.)
- Google Directory (.)
- http://unsolvedproblems.org/
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