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EXPONENTIAL STABILITY FOR ABSTRACT LINEAR AUTONOMOUS FUNCTIONAL DIFFERENTIAL EQUATIONS WITH INFINITE DELAY

摘要


Based on our preceding paper, this note is concerned with the exponential stability of the solution semigroup for the abstract linear autonomous functional differential equation x(t) = L(x_t) (*) where L is a continuous linear operator on some abstract phase space B into a Banach space E. We prove that the solution semigroup of (*) is exponentially stable if and only if the fundamental operator (*) is exponentially stable and the phase space B is an exponentially fading memory space.

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