105 Answered Questions
[SOLVED] Not especially famous, long-open problems which anyone can understand
- 2012-06-21 18:30:34
- David Feldman
- 64328 View
- 303 Score
- 105 Answer
- Tags: big-list teaching open-problems
1 Answered Questions
[SOLVED] improving known bounds for Pierce expansions; cash prize
- 2014-04-23 15:20:25
- Jeffrey Shallit
- 2020 View
- 44 Score
- 1 Answer
- Tags: nt.number-theory algorithms open-problems
0 Answered Questions
Limit cycles as closed geodesics(2)
- 2017-07-28 20:23:19
- Ali Taghavi
- 476 View
- 7 Score
- 0 Answer
- Tags: dg.differential-geometry riemannian-geometry ds.dynamical-systems open-problems limit-cycles
11 Answered Questions
[SOLVED] Is there a complex structure on the 6-sphere?
- 2009-10-22 23:16:31
- Deane Yang
- 24422 View
- 76 Score
- 11 Answer
- Tags: dg.differential-geometry complex-geometry open-problems
6 Answered Questions
[SOLVED] Can we cover the unit square by these rectangles?
- 2010-08-01 19:48:51
- Kaveh
- 10528 View
- 73 Score
- 6 Answer
- Tags: discrete-geometry open-problems computer-science packing-and-covering
5 Answered Questions
[SOLVED] Are nontrivial integer solutions known for $x^3+y^3+z^3=3$?
- 2011-03-11 19:05:47
- András Salamon
- 7576 View
- 33 Score
- 5 Answer
- Tags: diophantine-equations nt.number-theory reference-request open-problems
2 Answered Questions
[SOLVED] Is a smooth closed surface in Euclidean 3-space rigid?
- 2009-10-22 23:23:55
- Deane Yang
- 658 View
- 14 Score
- 2 Answer
- Tags: dg.differential-geometry open-problems
29 Answered Questions
[SOLVED] Proposals for polymath projects
- 2015-09-30 07:00:32
- Gil Kalai
- 27891 View
- 151 Score
- 29 Answer
- Tags: big-list big-picture open-problems
2 Answered Questions
[SOLVED] Integer-distance sets
- 2013-07-17 00:18:42
- Joseph O'Rourke
- 1461 View
- 18 Score
- 2 Answer
- Tags: reference-request mg.metric-geometry open-problems rational-points
0 Answered Questions
Hilbert 16th problem and dynamical Lefschetz trace formula
- 2019-06-06 20:27:37
- Ali Taghavi
- 457 View
- 10 Score
- 0 Answer
- Tags: dg.differential-geometry ds.dynamical-systems open-problems foliations
0 Answered Questions
Limit cycles of quadratic systems and closed geodesics(Finitness of $H(2)$)
- 2017-07-19 15:33:47
- Ali Taghavi
- 389 View
- 4 Score
- 0 Answer
- Tags: dg.differential-geometry riemannian-geometry ds.dynamical-systems open-problems curvature
2 Answered Questions
[SOLVED] Polynomial bijection from $\mathbb Q\times\mathbb Q$ to $\mathbb Q$?
- 2010-04-11 12:03:13
- Z.H.
- 41335 View
- 461 Score
- 2 Answer
- Tags: nt.number-theory open-problems
1 Answered Questions
[SOLVED] Nontrivial finite group with trivial group homologies?
- 2011-01-19 22:17:06
- Chris Gerig
- 4161 View
- 67 Score
- 1 Answer
- Tags: gr.group-theory group-cohomology open-problems
14 Answered Questions
[SOLVED] Open problems in Euclidean geometry?
- 2011-01-30 16:15:35
- Qfwfq
- 13305 View
- 45 Score
- 14 Answer
- Tags: mg.metric-geometry big-list convex-polytopes euclidean-geometry open-problems
12 Answered Questions
[SOLVED] Can a discrete set of the plane of uniform density intersect all large triangles?
- 2009-10-29 18:16:49
- Roland Bacher
- 1822 View
- 40 Score
- 12 Answer
- Tags: mg.metric-geometry discrete-geometry open-problems
5 Answered Questions
[SOLVED] Number of valid topologies on a finite set of n elements
- 2009-12-15 09:00:07
- Harry Gindi
- 4927 View
- 30 Score
- 5 Answer
- Tags: co.combinatorics open-problems
7 Answered Questions
[SOLVED] Convex hull in CAT(0)
- 2009-11-23 22:06:09
- Anton Petrunin
- 3698 View
- 23 Score
- 7 Answer
- Tags: mg.metric-geometry open-problems alexandrov-geometry convex-hulls
5 Answered Questions
[SOLVED] Surfaces filled densely by a geodesic
- 2013-04-14 13:02:43
- Joseph O'Rourke
- 2164 View
- 37 Score
- 5 Answer
- Tags: dg.differential-geometry mg.metric-geometry ds.dynamical-systems open-problems geodesics
4 Answered Questions
[SOLVED] Are most cubic plane curves over the rationals elliptic?
- 2010-01-10 16:59:58
- Idoneal
- 1726 View
- 30 Score
- 4 Answer
- Tags: elliptic-curves nt.number-theory open-problems
3 Answered Questions
[SOLVED] Is the fixed point property for posets preserved by products?
- 2014-08-31 14:19:27
- Mostafa Mirabi
- 1354 View
- 37 Score
- 3 Answer
- Tags: set-theory open-problems order-theory posets fixed-point-theorems
0 Answered Questions
Given a lattice L with n elements, are there finite groups H < G such that L $\cong$ the lattice of subgroups between H and G?
- 2012-01-15 09:32:23
- William DeMeo
- 921 View
- 21 Score
- 0 Answer
- Tags: lattices congruences finite-groups universal-algebra open-problems
2 Answered Questions
[SOLVED] Minimal graphs with a prescribed number of spanning trees
- 2012-04-10 12:45:21
- Jernej
- 1009 View
- 16 Score
- 2 Answer
- Tags: graph-theory extremal-graph-theory co.combinatorics open-problems
2 Answered Questions
[SOLVED] If all real conjugacy classes are strongly real, then all real irreps are "strongly real"(symmetric), true?
- 2012-10-07 07:19:32
- Alexander Chervov
- 519 View
- 2 Score
- 2 Answer
- Tags: rt.representation-theory finite-groups frobenius-schur-indicator open-problems
1 Answered Questions
[SOLVED] A maximal element, where Schur gives a minimal element
- 2012-10-01 09:16:34
- Denis Serre
- 605 View
- 12 Score
- 1 Answer
- Tags: matrices rt.representation-theory open-problems
0 Answered Questions
Forcing with c.c.c forcing notions, Cohen reals and Random reals
- 2013-11-03 06:54:59
- Mohammad Golshani
- 424 View
- 5 Score
- 0 Answer
- Tags: reference-request set-theory open-problems forcing
8 Answered Questions
[SOLVED] Two commuting mappings in the disk
- 2009-10-29 20:16:45
- fedja
- 10181 View
- 180 Score
- 8 Answer
- Tags: gn.general-topology open-problems
13 Answered Questions
[SOLVED] What are the big problems in probability theory?
- 2010-08-30 12:38:17
- Simon
- 33055 View
- 95 Score
- 13 Answer
- Tags: pr.probability big-list open-problems
11 Answered Questions
[SOLVED] What are some open problems in algebraic geometry?
- 2010-08-30 15:27:53
- Sun
- 14188 View
- 51 Score
- 11 Answer
- Tags: ag.algebraic-geometry vector-bundles moduli-spaces open-problems
4 Answered Questions
[SOLVED] If $2^x $and $3^x$ are integers, must $x$ be as well?
- 2010-03-09 01:21:45
- Alon Amit
- 9246 View
- 116 Score
- 4 Answer
- Tags: analytic-number-theory open-problems diophantine-approximation
2 Answered Questions
[SOLVED] Open problems/questions in representation theory and around?
- 2012-05-07 10:47:10
- Alexander Chervov
- 6170 View
- 40 Score
- 2 Answer
- Tags: rt.representation-theory big-list open-problems
