摘要
Let R be a Noetherian ring, M an Artinian R-module, and p ∈ CosRM. Thencograden. Homn（Rp, M） =-inf{i ｜πi（p, M） 〉 0} and πi（p, M） 〉 0 =〉 cogradeRpHomR（Rp, M） ≤ i ≤ fdRpHomR（Rp, M）,where πi （p,M） is the i-th dual Bass number of M with respect to p, cogradeRpHomR （Rp ,M） is the common length of any maxima[ HomR（Rp, M）-quasi co-regular sequence contained in pRp, and fdRp HomR（Rp, M） is the flat dimension of the Rp-module HomR（Rp, M）. We also study the relations among cograde, co-dimension and flat dimension of co-localization modules.
Let R be a Noetherian ring, M an Artinian R-module, and p ∈ CosRM. Thencograden. Homn（Rp, M） =-inf{i ｜πi（p, M） 〉 0} and πi（p, M） 〉 0 =〉 cogradeRpHomR（Rp, M） ≤ i ≤ fdRpHomR（Rp, M）,where πi （p,M） is the i-th dual Bass number of M with respect to p, cogradeRpHomR （Rp ,M） is the common length of any maxima[ HomR（Rp, M）-quasi co-regular sequence contained in pRp, and fdRp HomR（Rp, M） is the flat dimension of the Rp-module HomR（Rp, M）. We also study the relations among cograde, co-dimension and flat dimension of co-localization modules.
基金
Partially supported by the National Natural Science Foundation of China （No. 11271275）.
