Hello every one , in this pic i just printed ( Tensors_The Mathematics of Relativity Theory and Continuum Mechanics by Anadijiban Das ) here the author classifies the basis into 3 types 1- is the general basis (non-holomonic ) , 2- coordinate basis ( holomonic ),3- orthonormal basis ( non- holomonic)(adsbygoogle = window.adsbygoogle || []).push({});

I know that the coordinate basis represent the natural basis like cartesian , spherical(orthogonal) or any general system(non-orthogonal) coordinate basis, and I know that the orthonormal basis represent the normalized basis from the coordinate basis ( i.e. unit vector )

My question , What do the general basis represent ?!

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# Classifications of basis vectors

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