Chromatic Homotopy Theory
《Chromatic Homotopy Theory》 · 第 272 页 · Section 9.1.2，三维 Poincaré conjecture 的陈述
He then modified his original conjecture by asking whether every simply connected closed 3-manifold should be homeomorphic to \(S^3\). This fact, widely known as Poincaré’s Conjecture, was proved only in 2002 by Perelman.