# PERTURBATION RESULTS FOR HYPERBOLIC EVOLUTION SYSTEMS IN HILBERT SPACES

• Kang, Yong Han (Institute of Liberal Education Catholic University of Daegu) ;
• Jeong, Jin-Mun (Department of Applied Mathematics Pukyong National University)
• Published : 2014.01.31

#### Abstract

The purpose of this paper is to derive a perturbation theory of evolution systems of the hyperbolic second order hyperbolic equations. We give an example of a partial functional equation as an application of the preceding result in case of the mixed problems for hyperbolic equations of second order with unbounded principal operators.

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