This is the normal from model space to world space the derivation process of the transformation matrix, here don't understand how to derive the following above,

This is in the unity of normal transformation methods of operation, why should l take the mul (transpose (_World2Object), N) of transformation matrix can be put right,
The mul (N, _World2Object) that really don't understand, and put a lot of people say the right online more logical, that is why, unity should not be column matrix and transformation matrix on the left?