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Area Any area Mathematics (936) Computer science (28) Physics & astronomy (22) Chemistry & materials (13) Life sciences (6) Earth & society (6)
Field All of mathematics Algebra (45) Analysis (69) Combinatorics (158) Geometry (72) Graph theory (71) Logic & formalisation (10) Number theory (500) Probability (11)
Problem Any problem in geometry Ambidextrous Moving Sofa Constant Ben Green's Open Problem 41 Block Stacking Problem Borsuk's conjecture Conjecture about cardinality of Lindelöf spaces Conjectures about Weakly First Countable spaces Conjectures around homogeneous topological spaces Equidistant points in convex polygons Erdős Problem #100 Erdős Problem #101 Erdős Problem #102 Erdős Problem #103 Erdős Problem #104 Erdős Problem #1082 Erdős Problem #1083 Erdős Problem #1088 Erdős Problem #1207 Erdős Problem #212 Erdős Problem #213 Erdős Problem #352 Erdős Problem #503 Erdős Problem #506 Erdős Problem #507 Erdős Problem #508 Erdős Problem #660 Erdős Problem #89 Erdős Problem #91 Erdős Problem #959 Erdős Problem #96 Erdős Problem #97 Erdős Problem #98 Erdős Problem #982 Erdős Problem #99 Erdős squares in a square problem Favard-length decay exponent Flatness constant in dimension 3 Gilbert-Pollak conjecture (Steiner ratio) Green's Open Problem 42 Hadwiger covering / illumination number in ℝ^3 Heilbronn problem in a fixed bounding box Heilbronn problem in an arbitrary convex bounding box Inscribed square problem Integer part of area of a regular polygon with n sides each of length 1 Kakeya needle problem Kissing configurations in dimensions 10–31 Lebesgue universal covering constant Mahler volume product constant Mathoverflow 34145 Max to min ratios Moser's convex worm cover constant Moser's Worm Moving Sofa Constant Packing Packing in a dilate Pairwise touching cylinders Points on sphere maximizing the volume Reverse Brunn-Minkowski constant Smallest dimension in which Borsuk’s conjecture fails Sphere packing density in ℝ^4 Spherical Designs Tammes problem The Bing-Borsuk Conjecture The Erdős unit distance problem in the plane The first Atiyah–Sutcliffe conjecture The Hodge conjecture · grand challenge The kissing number in dimension 5 The no 5 on a sphere problem The Ovals Problem The three-dimensional moving sofa problem with two perpendicular turns Tight alternating knot constant Tight knot constant Toronto spaces
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