Systems of second order equations with nonnegative characteristic form

Abstract

The object of this paper is to study systems of second order equations with nonnegative characteristic form. The systemsconsidered will have the form and a bounded domain. Such equatiom are said to be of nonnegative characteristic form if for a , and. The primary results are existence and uniqueness theorems for weak solutions to boundary value problems for systems such a s (1.1).