1. May 14, 2014

### kjjtr

Hi.
Before question, sorry about my bad english. It's not my mother tongue.

J x J = i(h bar)J.

as the defining equations for the rotation group generators in the general case.
My question is, then tensor J must have one index which has three component? (e.g. x-y-z or rho-theta-z or r-theta-pi)

And, i also have one question about position operator. In wikipedia, its eigen'value' is said to be particle's position 'vector'. What this mean is that position operator is (rank 3) tensor operator?