A new obstruction to Arveson's hyperrigidity conjecture

Raphaël Clouâtre

Let $A$ be a unital $C^{\ast }$-algebra containing a closed two-sided ideal $J$ and an operator system $X$. We enlarge $X$ to an operator system $\mathcal{S}(X,J)$ in ${\mathbb{M}}_2(A)$,…