%0 Journal Article
%T Brief communication. An indefinite Sturm theory
%A Alessandro Portaluri
%J Mathematics
%D 2008
%I arXiv
%X Sturm theory for second order differential equations was generalized to systems and higher order equations with positive leading coefficient by several authors. Here we propose a Sturm oscillation theorem for indefinite systems of even order and with Dirichlet boundary conditions having strongly indefinite leading term.
%U http://arxiv.org/abs/0812.1933v1