Electronic Journal of Differential Equations,
Vol. 2007(2007), No. 38, pp. 1-12.

Title: A new proof of Harnack's inequality  for elliptic partial 
       differential  equations in divergence form

Authors: Raquel Crescimbeni (Univ. Nacional del Comahue, Argentina)
         Liliana Forzani    (Univ. Nacional del Litoral, Argentina)
	 Alejandra Perini   (Univ. Nacional del Comahue, Argentina)
 
Abstract:
 In this paper we give a new proof of Harnack's inequality for
 elliptic operator in divergence form. We imitate the proof given
 by Caffarelli for operators in nondivergence form.
  
Submitted January 9, 2006. Published March 1, 2007.
Math Subject Classifications: 35B65, 35B45
Key Words: Elliptic equations; divergence form; weak solutions; 
           Harnack inequality; Holder continuity.