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From: leiko on 11 Mar 2010 11:03
Consider this example: R is a ring and R'=R[x_1,..x_n]/
(r_1x_1+...r_nx_n -1) with r_i in R.

1. What is the image of the map Spec R'-> Spec R?
and
2. What is an element b\inR such that R'_b (localized at b) is a free
R_b (;ocalized at b) module?
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