Let A be a Cohen-Macaulay local ring with dimA = d ≥ 3, possessing the canonical module KA. Let a1, a2,..., ar (3 ≤ r ≤ d) be a subsystem of parameters of A, and set Q = (a1, a2,...,ar). We show that if the Rees algebra R(Q) of Q is an almost Gorenstein graded ring, then A is a regular local ring and a1, a2,...,ar is a part of a regular system of parameters of A.
ASJC Scopus subject areas
- 数学 (全般)