In 2000, the Clay Mathematics Institute announced the seven Millennium Prize Problems, and in 2003 the Poincaré conjecture was solved by Grigori Perelman (who declined to accept an award, as he was critical of the mathematics establishment).
En 2000, o Instituto Clay de Matemáticas anunciou os sete premios para os Problemas do Milenio, e en 2003 Grigori Perelman resolveu a conxectura de Poincaré, mais declinou o premio como crítica ás institucións matemáticas.