On the structure of the canonical tensor operators in the unitary groups. II. The tensor operators in U(3) characterized by maximal null space

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Abstract
The canonical splitting of the multiplicities of the unit tensor (Wigner) operators in U(3) was used in I to determine explicitly one Wigner operator in each (arbitrary) multiplicity set. The denominator function whose zeroes define the null space of this Wigner operator is presented in a new form from which the complete identification of the null space is made. Using the properties of the intertwining number of U(3), the null spaces of all the U(3) Wigner operators are determined, and it is demonstrated that the null spaces of the operators belonging to a multiplicity set are simply ordered by inclusion. The Wigner operator previously obtained from the canonical splitting is shown to be the one having the maximal null space for its multiplicity set.