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Zapiski Nauchnykh Seminarov LOMI, 1982, Volume 107, Pages 204–208
(Mi znsl3427)
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Short communications
Existence of invariant subspaces for operators with non-symmetrical growth of resolvent
B. M. Solomyak
Abstract:
Existence of invariant and hyperinvariant subspaces is obtained for some new classes of bounded operators in
a Banach space. The operators under consideration have “thin” spectrum (in the most interesting cases the spectrum is a single point) and a certain nonsymmetry in the growth of resolvent. For example, one can take $T$ such that $\sigma(T)=\{0\}$ and for some $\beta\in(0,\pi]$,
\begin{gather}
\|(\lambda J-T)^{-1}\|\le c|\lambda|^{-n},\quad|\arg\lambda|>\beta;\\
\quad\|(\lambda J-T)^{-1}\|\le c\exp|\lambda|^{-\pi/2\beta},
\quad|\arg\lambda|\le\beta.
\end{gather}
Hyperinvariant subspaces have the form $\operatorname{Ker}f(T)$, where $f(T)$ is defined in a special functional calculus.
Citation:
B. M. Solomyak, “Existence of invariant subspaces for operators with non-symmetrical growth of resolvent”, Investigations on linear operators and function theory. Part X, Zap. Nauchn. Sem. LOMI, 107, "Nauka", Leningrad. Otdel., Leningrad, 1982, 204–208; J. Soviet Math., 36:3 (1987), 423–426
Linking options:
https://www.mathnet.ru/eng/znsl3427 https://www.mathnet.ru/eng/znsl/v107/p204
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