2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/223323We give some properties (cancellation, representability, stratification) of the sheaf R^i f_* G for an affine relative curve f:U -> S admitting a smooth compactification and G a solvable group.24 pages, frenchAlgebraic Geometry14A20; 14H10text