Forgot password?
 快速注册
Search
View: 61|Reply: 0

[函数] 等式成立需要$f,g$互素吗?

[Copy link]

3150

Threads

8385

Posts

610K

Credits

$\style{scale:11;fill:#eff}꩜$

Credits
65392
QQ

Show all posts

hbghlyj Post time 2024-4-13 17:49 |Read mode
多项式$f,g$,$\gcd(g,g'')=1$,$0\le\deg f<\deg g$,则$$\sum_{\left\{\omega\inC:\ g(\omega)=0\right\}}\frac{f(\omega)}{(x-\omega)g'(\omega)}=\frac{f(x)}{g(x)}$$
等式成立不需要$f,g$互素?(若$f(\omega)=0$,将$\frac{f(\omega)}{(x-\omega)}$在$x=\omega$的值视为多项式$\frac{f(x)}{(x-\omega)}$在$x=\omega$的值.)

$\deg f=2,\deg g=3$时的验证:
RootSum[#^3 + a #^2 + b # + c &, (#^2 + p # + q)/(3 #^2 + 2 a # + b)/(x - #) &]==(p x + q + x^2)/(a x^2 + b x + c + x^3)
Untitled.gif

手机版|悠闲数学娱乐论坛(第3版)

2025-3-5 11:04 GMT+8

Powered by Discuz!

× Quick Reply To Top Return to the list