4-manifold


Smooth 4-dimensional Poincare conjecture ★★★★

Author(s): Poincare; Smale; Stallings

Conjecture   If a $ 4 $-manifold has the homotopy type of the $ 4 $-sphere $ S^4 $, is it diffeomorphic to $ S^4 $?

Keywords: 4-manifold; poincare; sphere

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