2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/127389Radial convolution operators on free groups with nonnegative kernel of weak type $(2,2)$ and of restricted weak type $(2,2)$ are characterized. Estimates of weak type $(p,p)$ are obtained as well for $1<p<2.$Functional Analysis43A15text