2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/155938We discuss solution concepts for linear hyperbolic equations with coefficients of regularity below Lipschitz continuity. Thereby our focus is on theories which are based either on a generalization of the method of characteristics or on refined techniques concerning energy estimates. We provide a series of examples both as simple illustrations of the notions and conditions involved but also to show logical independence among the concepts.35 pagesAnalysis of PDEsClassical Analysis and ODEs35D05;35D10;46F10;46F30text