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| Paper IPM / M / 16418 | ||||||||||||||||||
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In the present article, we investigate the following deformation problem. Let (R,\fm) be a local (graded local) Noetherian ring with a (homogeneous) regular element y ∈ \fm and assume that R/yR is quasi-Gorenstein. Then is R quasi-Gorenstein? We give positive answers to this problem under various assumptions, while we present a counter-example in general. We emphasize that absence of the Cohen-Macaulay condition requires delicate and subtle studies.
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