The Harnack inequality for quasilinear elliptic equations under minimal assumptions

In this note we prove the Harnack inequality for non negative solutions of the quasilinear equation \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\end{document}under very general structural assumptions satisfied by functions A and B.