Proof of the soul conjecture of Cheeger and Gromoll
The soul conjecture of Cheeger and Gromoll states that the soul of a noncompact Riemannian manifold of nonnegative sectional curvature is a point if there is a point in the manifold where the sectional curvatures of all the 2-planes is positive. The author proves a more precise version of this theorem.
scientific article; zbMATH DE number 663771