Nonsimplicity of certain universal ${\mathrm{C}}^{\ast }$-algebras

Marcel de Jeu, Rachid El Harti, Paulo R. Pinto

Given $n\ge 2$, $z_{ij}\in \mathbb{T}$ such that $z_{ij}={\overline{z}}_{ji}$ for $1\le i,j\le n$ and $z_{ii}=1$ for $1\le i\le n$, and integers $p_1,...,p_n\ge 1$, we show that…