 Michael Freedman solved the case formula_4 (in Top) in 1982 and received a Fields Medal in 1986.Grigori Perelman solved the case formula_5 (where Top, PL, and Diff all coincide) in 2003 in a sequence of three papers.He was offered a Fields Medal in August 2006 and the Millennium Prize from the Clay Mathematics Institute in March 2010, but declined both.