Some examples of two-dimensional regular rings

preprint2013arXivOpen access

Abstract

Let B be a ring and A=B[X,Y]/(aX2+bXY+cY2−1)A=B[X,Y]/(aX^2+bXY+cY^2-1) where a,b,c∈Ba,b,c\in B. We study the smoothness of A over B, and the regularity of B when B is a ring of algebraic integers.

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