Abstract
Let (A, m, k) be a Noetherian local ring and I an ideal of A. We set and call this graded A-algebra the Rees algebra of I. The importance of the Rees algebra R(I) is in the fact that Proj R(I) is the blowing up of Spec A with center in V(I). The Cohen-Macaulayness of Rees algebras was studied by many mathematicians. In [GS] S. Goto any Y. Shimoda gave a criterion for R(m) to be Cohen-Macaulay under the assumption that A is Cohen-Macaulay. Their results have been generalized to R(I) in [HI].

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