Relation between Geodesic and Exponential Map
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Theorem
Let $\struct {M, g, \nabla}$ be a Riemannian or pseudo-Riemannian manifold without boundary endowed with the Levi-Civita connection.
Let $TM$ be the tangent bundle of $M$.
Let $\exp$ be the exponential map.
Let $I \subseteq \R$ be an open real interval.
Let $\gamma_v : I \to M$ be the unique maximal geodesic such that:
- $\map {\gamma '} 0 = v$
where $v \in TM$.
Then:
- $\forall t \in I : \forall v \in TM : \map {\gamma_v} t = \map \exp {t v}$
Proof
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Sources
- 2018: John M. Lee: Introduction to Riemannian Manifolds (2nd ed.) ... (previous) ... (next): $\S 5$: The Levi-Civita Connection. The Exponential Map