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Stability of semigroups commuting with a compact operator
Authors:Vu Quô  c Phó  ng
Institution:Department of Mathematics, Ohio University, Athens, Ohio 45701
Abstract:It is proved that if $T(t), S(t)$ are bounded $C_{0}$-semigroups on Banach spaces $X$ and $Y$, resp., and $C:Y\to X$, $K:Y\to Y$ are bounded operators with dense ranges such that $C$ intertwines $T(t)$ with $S(t)$ and $K$ commutes with $S(t)$, then $T(t)$ is strongly stable provided $A$---the generator of $T(t)$---does not have eigenvalue on $i\mathbf {R}$. An analogous result holds for power-bounded operators.

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