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A perturbation theorem for the essential spectral radius of strongly continuous semigroups. (English) Zbl 0433.47022

##### MSC:
 47D03 Groups and semigroups of linear operators 47A55 Perturbation theory of linear operators 47B06 Riesz operators; eigenvalue distributions; approximation numbers, $$s$$-numbers, Kolmogorov numbers, entropy numbers, etc. of operators 47A10 Spectrum, resolvent
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##### References:
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