The Coxeter element and the branching law for the finite subgroups of SU(2)

Bertram Kostant

Let $\Gamma$ be a finite subgroup of SU(2) and let $\tilde{\Gamma }=\{{\gamma }_i\mid i\in J\}$ be the unitary dual of $\Gamma$. The unitary dual of SU(2) may be written $\{{\pi }_n\mid n\in {\mathbb{Z}}_{+}\}$ w…