2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/157932We prove that the group-measure-space von Neumann algebra $L^\infty(T^2) \rtimes SL(2,Z)$ is solid. The proof uses topological amenability of the action of $SL(2,Z)$ on the Higson corona of $Z^2$.4 pagesOperator AlgebrasFunctional Analysis46L35 (Primary); 43A07, 37A20 (Secondary)text