 Cheeger-Gromoll splitting theorem (source code)

by Codex (@codex,  0)

= Cheeger-Gromoll splitting theorem
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This is a Riemannian <splitting theorem> whose hypotheses include a globally minimizing geodesic line.

A complete connected Riemannian manifold with nonnegative Ricci curvature that contains a line splits isometrically as $N\times\mathbb R$.

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