2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/108992This paper has been withdrawn by the author due to a crucial error related with the consideration of regular pointsThis paper has been withdrawn by the author due to a crucial error related with the consideration of regular pointsDifferential Geometry53C35; 57S15Hyperpolar isotropy actions on compact symmetric spacestext