Unsolved Problem of the Week Archive (Popularity: ): A list of unsolved problems published by MathPro Press during 1995. Most Wanted List (Popularity: ): Elementary unsolved problems in mathematics, listed at the MathPages archive. Unsolved Mathematics Problems (Popularity: ): Compiled by Steven Finch. Descriptions of some unsolved problems and numerous links to other collections. Millennium Prize Problems (Popularity: ): 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 ... Marvin - Institute for Computational Applications (Popularity: ): A group of experts with academic backgrounds, solving problems involving mathematical, physical, numerical and computer sciences. Based in Ljubljana, Slovenia.