Richard Hamilton outlined a method of using Ricci flows to solve that problem named for this man.
John Stallings's "engulfing" method was used to solve one problem named for this man using the notion of PL-homotopy. A problem named for this mathematician was introduced in the same paper that showed that a certain object had a fundamental group of over 120. Michael Freedman solved a special case of a generalized version of that problem named for this man, which was solved for dimension higher than four by Stephen Smale. Richard Hamilton outlined a method of using Ricci flows to solve that problem named for this man. For 10 points, name this French mathematician who names a conjecture proven by Grigori Perelman which states that every closed, simply connected manifold is homeomorphic to the three-sphere.
John Stallings's "engulfing" method was used to solve one problem named for this man using the notion of PL-homotopy.
Henri Poincaré