Oscillation Criteria for Linear Matrix Hamiltonian Systems

Abstract In this paper we present oscillation criteria in terms of the coefficient functions for the matrix linear Hamiltonian system U ′= A ( x )  U + B ( x )  V , V ′= C ( x )  U − A *( x )  V under the hypothesis H :  A ( x ),  B ( x )= B *( x )>0 and C ( x )= C *( x ) are n × n matrices of real valued continuous functions on the interval I =[ a , ∞), (−∞ a ). These criteria generalize earlier results due to Etgen and Pawlowski (1976), Erbe, Qingkai Kong and Shigui Ruan (1993), and Fanwei Meng, Jizhong Wang, and Zhaowen Zheng (1998) for the system ( P ( x )  U ′)′+ Q ( x )  U =0 or its special cases.