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Millennium Prize Problems - http://www.claymath.org/millennium/
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. |
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Mathematical Problems - http://www.mathematik.uni-bielefeld.de/~sillke/problems.html
In various subjects, compiled by Torsten Sillke. |
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Most Wanted List - http://mathpages.com/home/mwlist.htm
Elementary unsolved problems in mathematics, listed at the MathPages archive. |
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Unsolved Problem of the Week Archive - http://cage.rug.ac.be/~hvernaev/problems/archive.html
A list of unsolved problems published by MathPro Press during 1995. |