it should be -> ϱ sin ϑ ]]>

and DualBasSph.NatBasSph //MatrixForm should give the “Identity matrix” ]]>

I need to clarify something from basic tensor algebra.

Given arbitrary tensors A, B, C where

AB = C

Then, is

B = (A^-1)C

or

B = CA^-1

What is the rule behind getting B?