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[数论] $x^2+y^3=z^6$ Generalized Fermat Equation

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hbghlyj Post time 2023-11-3 08:58 |Read mode
致各位论坛网友:

由于 hbghlyj 操作数据库失误导致由 2023-9-26 至 2023-11-5 间期的所有帖子的内文都被清空,在此给大家真诚道歉。

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 Author| hbghlyj Post time 2024-4-11 03:31
原1楼內容…想不起来了
再补一个吧:

$y^3=(z^3-x)(z^3+x)$
$\gcd(z,x)=1\implies\gcd(z^3-x,z^3+x)\mid2$
$z^3-x=a^3,z^3+x=b^3\implies a^3+b^3=2z^3$
$z^3-x=2a^3,z^3+x=4b^3\implies z^3+(-a)^3=2b^3$

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 Author| hbghlyj Post time 2024-4-11 04:24
$a^3+b^3=2z^3$
$\gcd(a,b)=1\implies 2\nmid a,b$.
$u:=\frac{a+b}2,v:=\frac{a-b}2\implies u (u^2+3v^2)= z^3$
$\implies u = r^3,u^2+3v^2= s^3$
$(u+\sqrt{-3}v)(u-\sqrt{-3}v)= s^3$
NumberFieldClassNumber($\sqrt{-3}$)=1 Untitled.gif
$\implies u+\sqrt{-3}v=a_0^3,u-\sqrt{-3}v=b_0^3,a_0^3+b_0^3=2r^3,|r|<|z|$

接下来不知应该怎么做,已在MSE提问:math.stackexchange.com/questions/4896804/question-about-a-proof- ... olution-for-x2-y3-z6

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 Author| hbghlyj Post time 2024-4-11 05:52
H. Cohen, Number theory, Volume II: Analytic and modern tools, Graduate Texts in Mathematics 240, Springer, New York, 2007.
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