Functional Analysis and Its Applications · 1975 · 103 citations · 5 references
Natural SciencesPhysicsGravitationTopologyCurved SpacetimeDifferential GeometryMetric GeometryProjective GeometryRiemannian GeometrySpacetime GeometryCurvatureCurvature TensorsHomogeneous SpacesRicci CurvatureRicci Tensor
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S. Bochner · Annals of Mathematics · 1948 · 679 citations
A note on curvature and fundamental group
John Milnor · Journal of Differential Geometry · 1968 · 567 citations · Full text
D. V. Alekseevskiĭ · Functional Analysis and Its Applications · 1968 · 152 citations