: Mathématiques: fundamental theorem of Riemannian geometry

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fundamental theorem of Riemannian geometry

In the mathematical field of Riemannian geometry, the fundamental theorem of Riemannian geometry states that on any Riemannian manifold (or pseudo-Riemannian manifold) there is a unique affine connection that is torsion-free and metric-compatible, called the Levi-Civita connection or (pseudo-)Riemannian connection of the given metric. Because it is canonically defined by such properties, often this connection is automatically used when given a metric.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Fundamental_theorem_of_Riemannian_geometry)

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