Timeline for Can extremal matrices of subcones of psd matrices have low rank?
Current License: CC BY-SA 3.0
7 events
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| Sep 13, 2011 at 5:16 | comment | added | user2529 | Hi Robert. I have an observation. If A spans an extremal ray, and $B\in C$ is distinct from A, then every matrix in the line segment (A, B) must have rank strictly larger than A. | |
| Sep 7, 2011 at 16:25 | answer | added | Robert Israel | timeline score: 2 | |
| Sep 7, 2011 at 1:44 | comment | added | user2529 | Yes Robert. I'm assuming $\dim \Pi > d/2$. | |
| Sep 7, 2011 at 1:43 | history | edited | user2529 | CC BY-SA 3.0 |
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| Sep 6, 2011 at 20:01 | comment | added | Robert Israel | Are you somehow excluding the cases where $\dim \Pi = 1$? In such cases $\text{rank} A$ could be $d$. | |
| Sep 6, 2011 at 20:00 | comment | added | Igor Rivin | Improved how??? | |
| Sep 6, 2011 at 17:09 | history | asked | user2529 | CC BY-SA 3.0 |