Duke Mathematical Journal · 2009 · 77 citations · 16 references
Let $(M,g)$ be an Einstein manifold of dimension $n \\geq 4$ with nonnegative isotropic curvature. We show that $(M,g)$ is locally symmetric
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Three-manifolds with positive Ricci curvature
Richard S. Hamilton · Journal of Differential Geometry · 1982 · 2.9K citations · Full text
Four-manifolds with positive curvature operator
Richard S. Hamilton · Journal of Differential Geometry · 1986 · 794 citations · Full text