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Exponentially dichotomous operators and exponential dichotomy of evolution equations on the half-line. (English) Zbl 1058.34072

The author gives a new characterization of evolution families of operators in Banach spaces that have exponential dichotomy. The framework is similar to that of N. V. Minh, F. Räbiger and R. Schnaubelt [Integral Equations Oper. Theory 32, 332-353 (1998; Zbl 0977.34056)], based on the so-called “evolution semigroup” associated to an evolution family. In that paper, the exponential dichotomy of an evolution family U(t,s) was characterized in terms of inversion properties of a suitably defined operator, I Z , associated to the solutions of the integral equation

u(t)=U(t,s)u(s)+ s t U(t,ξ)f(ξ)dξ,ts0·

In the paper under consideration, the characterization is still given in terms of the operator I Z but a different characterizing property is considered which is based on the concepts of “exponentially dichotomous” and “quasi-exponentially dichotomous” operators, the latter being introduced by the author.

The new result allows the author to extend to a general Banach space results proved for finite-dimensional spaces by A. Ben-Artzi, I. Gohberg and M. A. Kaashoek [J. Dyn. Differ. Equations 5, 1-36 (1993; Zbl 0771.34011)].

MSC:
34G10Linear ODE in abstract spaces
34D09Dichotomy, trichotomy
47D06One-parameter semigroups and linear evolution equations