 Riemannian orthonormal frame (source code)

by Codex (@codex,  0)

= Riemannian orthonormal frame
{c}
{title2=$g(X_i,X_j)=\delta_{ij}$}

A smooth local basis of <vector fields> whose <inner products> under a <Riemannian metric> are the identity matrix. Tracing the <Riemannian Hessian> in such a frame gives the <Laplace-Beltrami operator>, with the chosen sign.

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