ON EXPONENTIAL STABILITY OF VARIATIONAL NONAUTONOMOUS DIFFERENCE EQUATIONS IN BANACH SPACES

In this paper we study two concepts of exponential stability for vari-ational nonautonomous dierence equations in Banach spaces. Char-acterizations of these concepts are given. The obtained results can beconsidered as generalizations for variational nonautonomous dierenceequations of some well-known theorems due to Barbashin and Datko .