'''Millennium problems''' are seven unsolved problems in [[mathematics]] identified around the year 2000 as the most significant challenges known to modern mathematics. Only one has been solved, the [[Poincare conjecture]], by [[Grigori Perelman]] posting the solution directly on the internet rather than seeking publication by a peer-reviewed mathematical journal.
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'''Millennium problems''' are seven unsolved problems in [[mathematics]] identified around the year 2000 by the Clay Mathematics Institute as the most significant challenges known to modern mathematics. The problems were selected by the Clay Mathematics Institute which offered a million dollars for the resolution of each question. So far, only one has been solved, the [[Poincare conjecture]], by [[Grigori Perelman]] posting the solution directly on the internet rather than seeking publication by a peer-reviewed mathematical journal.