How to calculate the Norm of a vector in xAct

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Oct 13, 2016, 11:48:00 AM10/13/16

to xAct Tensor Computer Algebra

dear all,

If I define a vector like this, how to calculate the Norm, and the gradient?

<< xAct`xTensor`;

DefManifold[M, 3, {a, b, c, d, e, f, g, h, i, j, k, l}];

DefTensor[X[a], M];

Thanks.

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