2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148338The relation between the $\widehat\gl(\infty)$ symmetry of the Kadomtsev-Petviashvili hierarchy and the Kac-Moody-Virasoro Lie point symmetries of the individual equations is established. The Lie point symmetries are shown to be the only local ones.16 pages, CRM-1936High Energy Physics - Theorytext