Fix convention of PolynomialTensor basis change #805
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In general, we rotate a matrix M to M' is to apply a rotation matrix R:
M' = R @ M @ R.T
The corresponding Einstein notation is
M'^{p_1p_2} = R^{p_1}_{a_1} R^{p_2}_{b_1} M^{a_1a_2}
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In general, we rotate a matrix M to M' is to apply a rotation matrix R: M' = R @ M @ R.T
The corresponding Einstein notation is
M'^{p_1p_2} = R^{p_1}{a_1} R^{p_2}{b_1} M^{a_1a_2}