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[函数] 等式成立需要$f,g$互素吗?

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hbghlyj posted 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)
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