2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56954We have solved completely the problem of the description of quasi-linear hyperbolic differential equations in two independent variables that are invariant under three-parameter Lie groups.8 padge, accepted for publication in proceedings of Symmytry-2001Mathematical PhysicsAnalysis of PDEsGroup TheoryInvariance of the quasilinear equations of hiperbolic type with respect to the three-parametric Lie algebrastext