Poincaré Conjecture

The Poincaré Conjecture which was originally a conjecture, was solved in 2003 and is now a theorem. It states that every closed topological three-dimensional manifold is homeomorphic to a 3-sphere. The Poincaré Conjecture which was originally a conjecture, was solved in 2003 and is now a theorem. It states that every closed topological three-dimensional manifold is homeomorphic to a 3-sphere. This article is a stub. Help us out by expanding it.