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タイトル: | Properties of $C$-normal operators (Research on preserver problems on Banach algebras and related topics) |
著者: | KO, Eungil LEE, Ji Eun LEE, Mee-Jung |
キーワード: | 47A05 47B15 47B20 $C$-normal operator complex symmetric operator operator transforms |
発行日: | Jul-2023 |
出版者: | Research Institute for Mathematical Sciences, Kyoto University |
誌名: | 数理解析研究所講究録別冊 |
巻: | B93 |
開始ページ: | 117 |
終了ページ: | 124 |
抄録: | We study various properties of $C$-normal operators, i.e., $T*T$ = $CTT*C$ holds for a conjugation $C$ on $H$. Especially, we show that $T$ − λ$I$ is $C$-normal for all λ ∈ ℂ if and only if $T$ is a complex symmetric operator with the conjugation $C$. In addition, we prove that if $T$ is $C$-normal, then $T$ is normal ⇔ $T$ is quasinormal ⇔ $T$ is hyponormal ⇔ $T$ is $p$-hyponormal for 0 < $p$ ≤ 1. Finally, we investigate equivalent conditions so that Aluthge and Duggal transforms of $C$-normal operators to be $C$-normal operators. |
著作権等: | © 2023 by the Research Institute for Mathematical Sciences, an International Joint Usage/Research Center located in Kyoto University. All rights reserved. Printed in Japan. |
URI: | http://hdl.handle.net/2433/284874 |
出現コレクション: | B93 Research on preserver problems on Banach algebras and related topics |
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