Timeline for A direct proof of a property of symmetric 2x2-determinants
Current License: CC BY-SA 3.0
12 events
| when toggle format | what | by | license | comment | |
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| Jun 28, 2017 at 12:28 | comment | added | Dima Pasechnik | @DenisSerre I am aware of hyperbolic polynomials, but they appear to be sort of orthogonal concept---they have all roots real, as opposed to (generically) having no real roots. | |
| Jun 28, 2017 at 11:19 | comment | added | Denis Serre | Perhaps you should learn about hyperbolic polynomials, a notion due to Garding. | |
| Jun 22, 2017 at 8:41 | vote | accept | Dima Pasechnik | ||
| Jun 21, 2017 at 11:25 | comment | added | Dima Pasechnik | I've edited the question to work this comment in. | |
| Jun 21, 2017 at 11:16 | history | edited | Dima Pasechnik | CC BY-SA 3.0 |
worked in the Ivan's comment.
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| Jun 21, 2017 at 11:07 | comment | added | Dima Pasechnik | thanks, right---as I need something that "works" in $\mathbb{R}[a,b,c]$ I missed that indeed my conditions are equivalent to the eigenvalues of the 2x2 matrix in question being positive semidefinite... | |
| Jun 21, 2017 at 10:31 | answer | added | darij grinberg | timeline score: 3 | |
| Jun 21, 2017 at 10:28 | comment | added | Ivan Izmestiev | One classical generalization is the convexity of the cone of positive semidefinite quadratic forms. | |
| S Jun 21, 2017 at 10:10 | history | edited | Dima Pasechnik | CC BY-SA 3.0 |
Minor edits
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| S Jun 21, 2017 at 10:10 | history | suggested | Rodrigo de Azevedo | CC BY-SA 3.0 |
Minor edits
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| Jun 21, 2017 at 10:06 | review | Suggested edits | |||
| S Jun 21, 2017 at 10:10 | |||||
| Jun 21, 2017 at 9:12 | history | asked | Dima Pasechnik | CC BY-SA 3.0 |