2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/110037We give a sharp bound on the number of automorphisms of a stable curve of a given genus and describe all curves attaining this bound.16 pages. v2 corrects an error in the Main Theorem and several typos. v3 fixes a gap in the proof and corrects more typosAlgebraic Geometry14H37text