Timeline for Are there any known criteria for quadratic mapping from R^n to R^n being surjective?
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Sep 6, 2016 at 8:11 | comment | added | Qwerty | Concerning quadratic mappings acting from $\mathbb{R}^3$ to $\mathbb{R}^3$ in the above mentioned paper it is proved that the following are equivalent: (i) quadratic mapping $Q$ is surjective; (ii) surjectivity of $Q$ is stable, i.e. any “close” to $Q$ quadratic mapping is surjective; (iii) $Q(x)\neq 0$ for each $x\neq 0$, and for each regular value $y$ of the mapping $Q$ the set $Q^{−1}(y)$ consists of 2 or 6 points. | |
| S Sep 5, 2016 at 14:28 | history | suggested | Amir Sagiv | CC BY-SA 3.0 |
english and formatting
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| Sep 5, 2016 at 13:56 | comment | added | Amir Sagiv | I think it is interesting that you state the main results here, if you can. | |
| Sep 5, 2016 at 13:55 | review | Suggested edits | |||
| S Sep 5, 2016 at 14:28 | |||||
| Sep 5, 2016 at 13:48 | review | Late answers | |||
| Sep 5, 2016 at 13:56 | |||||
| Sep 5, 2016 at 13:33 | review | First posts | |||
| Sep 5, 2016 at 13:53 | |||||
| Sep 5, 2016 at 13:33 | history | answered | Qwerty | CC BY-SA 3.0 |