2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56969A weak Guderley-Morawetz problem is formulated for a mixed elliptic-hyperbolic system that arises in models of wave propagation in cold plasma. Weak solutions are shown to exist in a weighted Hilbert space. This result extends work by Yamamoto.18 pages, tcilatexMathematical PhysicsAnalysis of PDEs35M10text