# Connected Riemannian Manifold with Restricted Exponential Map defined on Whole Tangent Space is Metrically Complete

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## Theorem

Let $\struct {M, g}$ be a connected Riemannian manifold.

Let $T_p M$ be the tangent space at $p \in M$.

Let $\exp_p$ be the restricted exponential map defined on the whole $T_p M$.

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Then $M$ is metrically complete.

## Proof

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## Sources

- 2018: John M. Lee:
*Introduction to Riemannian Manifolds*(2nd ed.) ... (previous) ... (next): $\S 6$: Geodesics and Distance. Completeness