Øyvind
>
> [0] https://github.com/sympy/sympy/tree/master/sympy/tensor
> [1] http://www.ginac.de/reference/classGiNaC_1_1varidx.html
>
>
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;s written on sympy about this subject.
Thanks a lot.
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Alexander Gallego C.
Grupo de Fenomenología de Interacciones Fundamentales.
Instituto de Física, Facultad de Ciencias Exactas Y Naturales.
Universidad de Antioquia.
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