- Analysis@ (3)
- Combinatorics@ (7)
- Dynamical Systems@ (3)
- Geometry@ (4)
- Graph Theory@ (13)
- Number Theory@ (41)
- Topology@ (4)
See also:
Most Wanted List
mathpages.com
Elementary unsolved problems in mathematics, listed at the MathPages archive.
Millennium Prize Problems
claymath.org
The seven problems proposed by the Clay Mathematics Institute: P versus NP; Hodge Conjecture; Poincaré Conjecture; Riemann Hypothesis; Yang-Mills Existence and Mass Gap; Navier-Stokes Existence and Smoothness; Birch and Swinnerton-Dyer Conjecture. Resources include articles on each problem by leading researchers.
Mathematical Problems
mathematik.uni-bielefeld.de
In various subjects, compiled by Torsten Sillke.
Unsolved Problem of the Week Archive
cage.rug.ac.be
A list of unsolved problems published by MathPro Press during 1995.
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