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Hypersurfaces of bounded Cohen--Macaulay type | | Graham J. Leuschke
; Roger Wiegand
; | | Date: |
10 Aug 2002 | | Subject: | Commutative Algebra MSC-class: 13C14 (Primary), 13C05, 13H10 (Secondary) | math.AC | | Abstract: | Let R = k[[x_0,...,x_d]]/(f), where k is a field and f is a non-zero non-unit of the formal power series ring k[[x_0,...,x_d]]. We investigate the question of which rings of this form have bounded Cohen--Macaulay type, that is, have a bound on the multiplicities of the indecomposable maximal Cohen--Macaulay modules. As with finite Cohen--Macaulay type, if the characteristic is different from two, the question reduces to the one-dimensional case: The ring R has bounded Cohen--Macaulay type if and only if R is isomorphic to k[[x_0,...,x_d]]/(g+x_2^2+...+x_d^2), where g is an element of k[[x_0,x_1]] and k[[x_0,x_1]]/(g) has bounded Cohen--Macaulay type. We determine which rings of the form k[[x_0,x_1]]/(g) have bounded Cohen--Macaulay type. | | Source: | arXiv, math.AC/0208083 | | Services: | Forum | Review | PDF | Favorites | |
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