2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/71984Through the Maximum principle we define the principal eigenvalue for a class of fully-nonlinear operators that are the non-variational equivalent of the p-Laplacian. We also obtain some a priori Holder estimates for non-negative solutions below that eigenvalue.35 pages, 0 figuresAnalysis of PDEs35J60; 35J70First eigenvalue and Maximum principle for fully nonlinear singular operatorstext