2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/79286One applies the symmetry group theory for study the partial differential equations of Tzitzeica surfaces theory. One finds infinitesimal symmetries, Lagrangians and a new solution of Titzeica equation.21 pagesDifferential GeometryRepresentation Theory58G35; 53C99; 35A15Symmetry groups and Lagrangians associated to Tzitzeica surfacestext