Definition:Velocity of Main Curve
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Definition
Let $\struct {M, g}$ be a Riemannian manifold.
Let $I, J \subseteq \R$ be real intervals.
Let $\map {\Gamma_s} t : J \times I \to M$ be the main curve, where $\times$ denotes the cartesian product.
Suppose $\map {\Gamma_s} t$ is differentiable on $I$.
Then the velocity of the main curve is denoted by:
- $\partial_t \map {\Gamma} {s, t} = \map {\paren {\Gamma_s}'} t$
Here $\partial_t \map {\Gamma} {s, t} \in T_{\map \Gamma {s, t} } M$ where $T_p M$ is the tangent space of $M$ at $p \in M$, and $\map \Gamma {s, t}$ is the one-parameter family of curves on $M$.
Sources
- 2018: John M. Lee: Introduction to Riemannian Manifolds (2nd ed.) ... (previous) ... (next): $\S 6$: Geodesics and Distance. Geodesics and Minimizing Curves