This article is about local coordinates for manifolds. For the use in Euclidean geometry, see
Cartesian coordinates and Affine space § Affine coordinates.
In Riemannian geometry and relativity theory, an orthonormal frame is a tool for studying the structure of a differentiable manifold equipped with a metric. If M is a manifold equipped with a metric g, then an orthonormal frame at a point P of M is an ordered basis of the tangent space at P consisting of vectors which are orthonormal with respect to the bilinear form gP.[1]
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References
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