Definition:Harmonic Function/Riemannian Manifold
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Definition
Let $\struct {M, g}$ be a compact Riemannian manifold with or without boundary.
Let $\map {C^\infty} M$ be the smooth function space.
Let $u \in \map {C^\infty} M$ be a smooth real function on $M$.
Let $\nabla^2$ be the Laplace-Beltrami operator.
Then $u$ is said to be harmonic if and only if:
- $\nabla^2 u = 0$
Sources
- 2018: John M. Lee: Introduction to Riemannian Manifolds (2nd ed.) ... (previous) ... (next): $\S 2$: Riemannian Metrics. Problems