2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74000In this paper we consider Hopf's Lemma and the Strong Maximum Principle for supersolutions to a class of non elliptic equations. In particular we prove a sufficient condition for the validity of Hopf's Lemma and of the Strong Maximum Principle and we give a condition which is at once necessary for the validity of Hopf's Lemma and sufficient for the validity of the Strong Maximum Principle.27 pages,4 figuresAnalysis of PDEstext