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{{unsolved|mathematics|Which finite groups are BI-groups?}} ...bai's problem''' is a problem in [[algebraic graph theory]] first proposed in 1979 by [[László Babai]].<ref>{{Citation |last1=Babai |first1=László |autho ...

{{short description|Mathematical problem concerning limit cycles in dynamical systems}} ...ematics|Is there a [[uniformly bounded|uniform bound]] on [[limit cycles]] in generic finite-parameter families of [[vector fields]] on a sphere?}} ...

{{unsolved|mathematics|Is every pair of a square number and a pronic number (both greater than one ...ematician [[Ludvig Oppermann]], who announced it in an unpublished lecture in March 1877.<ref>{{Citation |first=L. |last=Oppermann |title=Om vor Kundskab ...

{{Short description|Unsolved problem in mathematics}} {{unsolved|mathematics|Can the totient function of a composite number <math>n</math> divide <math> ...

...lean function]]s originally conjectured by Ehud Friedgut and [[Gil Kalai]] in 1996.<ref>{{cite journal|last1=Friedgut|first1=Ehud|last2=Kalai|first2=Gil| ...= \sum_{S \subset [n]} \widehat{f}(S) x_S, \text{ where } x_S = \prod_{i \in S} x_i. </math> ...

In mathematics, the '''Zeeman conjecture''' or '''Zeeman's collapsibility conjecture''' as ...lassification of 3-Manifolds|volume=9|series=Algorithms and Computation in Mathematics|first=Sergei|last=Matveev|publisher=Springer|year=2007|isbn=9783540458999|p ...

...e''' is, as of 2018, an unsolved conjecture proposed by [[Shing-Tung Yau]] in 1982. It asks: ...n <math>S^3</math> will have an upper bound depending only on the [[genus (mathematics)|genus]]. ...

{{short description|Two unsolved conjectures in algebraic number theory}} ...[algebraic number theory]] proposed by [[Ralph Greenberg]]. Both are still unsolved as of 2021. ...

{{Short description|Unsolved mathematical problem}} ...te = 23 October 2017| doi-access = free}}</ref> This problem is still open in full generality. The problem asks: ...

...ess Media|isbn=9781461209638|language=en}}</ref> such as [[Magic triangle (mathematics)|magic triangles]].<ref>{{Cite web|url=http://recmath.org/Magic%20Squares/p ...ngles.gif|upright=1.8|center|thumb|This displays order 3 [[Magic triangle (mathematics)|magic triangles]], a type of '''magic polygon.''']] ...

{{Short description|Unsolved problem in graph theory}} ...e=January 1968|title=Steiner Minimal Trees|journal=SIAM Journal on Applied Mathematics|volume=16|issue=1|pages=1–29|doi=10.1137/0116001|s2cid=123196263|issn=0036- ...

...atics|date=January 2014|reason=Needs to be checked by editor with advanced mathematics knowledge}} ...ime divisors of [[Mersenne numbers]] and was made by [[Donald B. Gillies]] in a 1964 paper<ref>{{cite journal ...

...|txt|first=Alexander|last=Grothendieck|year=1997|authorlink=Grothendieck}} in a 1983 letter to [[Gerd Faltings]]. [[Category:Unsolved problems in geometry]] ...

...|first1= Richard K. |author1-link=Richard K. Guy |title=Unsolved Problems in Number Theory |url= |issue=3rd edition|year=2004 |editor1-last= Bencsáth |e ...l problems described by [[Richard K. Guy]] in his book ''Unsolved problems in number theory''.<ref name="rguy" /> ...

{{unsolved|mathematics|Is there a [[dense set]] of points in the plane at rational distances from each other?}} In [[mathematics]], the '''Erdős–Ulam problem''' asks whether the plane contains a [[dense s ...

{{Short description|Unsolved geometry problem}} ...points in the set. A shape covers a set if it contains a congruent subset. In other words the set may be rotated, translated or reflected to fit inside t ...

{{unsolved|mathematics|Given a width of tic-tac-toe board, what is the smallest dimension such tha ...are a total of <math>\frac{\left(n+2\right)^d-n^d}{2}</math> winning lines in a ''n''^''d'' game.<ref name=":1" /><ref>{{Cite book |last=Epstei ...

{{short description|Unsolved problem in number theory}} In [[mathematics]], the '''Manin conjecture''' describes the conjectural distribution of rat ...

{{short description|Unsolved problem in matrix analysis}} ...nsolved problem in [[matrix analysis]]. It was proposed by Michel Crouzeix in 2004,<ref>{{Cite journal|last=Crouzeix|first=Michel|date=2004-04-01|title=B ...

{{unsolved|mathematics|Does there exist a [[strongly regular graph]] with parameters (99,14,1,2)?} [[File:33-duoprism graph.svg|thumb|A 9-vertex graph in which every edge belongs to a unique triangle and every non-edge is the dia ...