Timeline for Mapping inclusion theorem for the numerical range
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 25, 2019 at 6:19 | vote | accept | Jochen Glueck | ||
| Mar 25, 2019 at 1:17 | answer | added | Narutaka OZAWA | timeline score: 2 | |
| Mar 24, 2019 at 17:02 | comment | added | Jochen Glueck | @NarutakaOZAWA: Great example, thank you! If you add it as an answer I will, of course, accept it. | |
| Mar 23, 2019 at 12:38 | comment | added | Narutaka OZAWA | You can try $N=[\begin{smallmatrix} 0&1\\0&0\end{smallmatrix}]$ and $f(z)=z+z^2+\cdots+z^m$. On the one hand $f(N)=N$ and $W(N)=B(0,1/2)$. On the other hand $f(z)\approx z(1-z)^{-1}=(1-z)^{-1} -1$ and ${\rm co}f(B(0,1/2))$ misses $-1/2$. | |
| Mar 23, 2019 at 9:44 | history | edited | Jochen Glueck | CC BY-SA 4.0 |
deleted 51 characters in body
|
| Mar 23, 2019 at 9:29 | history | asked | Jochen Glueck | CC BY-SA 4.0 |