Spectrum of a weakly hypercyclic operator meets the unit circle
classification
🧮 math.FA
keywords
circlehypercyclicmeetsoperatorspectrumunitweaklybanach
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It is shown that every component of the spectrum of a weakly hypercyclic operator meets the unit circle. The proof is based on the lemma that a sequence of vectors in a Banach space whose norms grow at geometrical rate doesn't have zero in its weak closure.
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