Timeline for Can we write each positive integer as $w^2+x^2(1+2y^2+2z^2)$ with $w,x,y,z\in\mathbb Z$ and $x\not=0$?
Current License: CC BY-SA 4.0
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| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 10, 2018 at 11:44 | history | asked | Zhi-Wei Sun | CC BY-SA 4.0 |