Timeline for Let $T\in B(H)$. Then prove that $T$ is a contraction if and only if the closed unit disc is spectral set for $T$
Current License: CC BY-SA 4.0
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| when toggle format | what | by | license | comment | |
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| Mar 13, 2023 at 15:27 | comment | added | Jochen Glueck | Hint: Use the Taylor expansion of $p/q$ around $0$. I don't think this is a research level question, though. | |
| S Mar 13, 2023 at 13:19 | review | First questions | |||
| Mar 13, 2023 at 14:00 | |||||
| S Mar 13, 2023 at 13:19 | history | asked | DeltaEpsilon | CC BY-SA 4.0 |