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By using the theory of strongly continuous cosine families and the properties of completely continuous maps, we study the existence of mild, strong, classical and asymptotically almost periodic solutions for a functional second order abstract Cauchy problem with nonlocal conditions.
It will be proved that if is a bounded nilpotent operator on a Banach space of order , where is an integer, then the -th order Cesàro mean and Abel mean of the uniformly continuous semigroup of bounded linear operators on generated by , where , satisfy that (a) for all ; (b) for all ; (c) . A similar result will be also proved for the uniformly continuous cosine function of bounded linear operators on generated by .
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