# 扶磊《代数几何》56页注释（3）

reversing the above argument的时候，遇到了一个拦路虎。

$S_{\bar{x_i}}\otimes_AA_p/pA_p={0}\Rightarrow S_{(\bar{x_i})}\otimes_AA_p/pA_p=0$

'Let us note that $B_f$ is a graded $B_{(f)}$-algebra, the homogeneous elements of degree $n(n\in \Bbb Z)$ being of the form $bf^{-N}$ with $b\in B$ and $\deg b=Nr+n$."