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Seven open problems were posted in the year two thousand with a prize on each of a million.

Mathematics Facts, sourced to Clay Mathematics Institute.

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The Clay Mathematics Institute chose them to mark the century and set a million dollar prize for each. One has been settled. Grigori Perelman proved the Poincare conjecture and then declined both the prize and the Fields Medal, saying the recognition was misplaced. The remaining six include the Riemann hypothesis, which Hilbert had already put on his own famous list a hundred years earlier.

The claim comes from Clay Mathematics Institute.

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