On the structure of Cohen-Macaulay modules over hypersurfaces of countable Cohen-Macaulay representation type

Details On the structure of Cohen-Macaulay modules over hypersurfaces of countable Cohen-Macaulay representation type On the structure of Cohen-Macaulay modules over hypersurfaces of countable Cohen-Macaulay representation type

2010-01-31

arxiv.org/abs/1002.0137v3

Mathematics

Commutative Algebra

12 pages, to appear in Journal of Algebra

Scientific paper

Let R be a complete local hypersurface over an algebraically closed field of characteristic different from two, and suppose that R has countable Cohen-Macaulay representation type. In this paper, it is proved that the maximal Cohen-Macaulay R-modules which are locally free on the punctured spectrum are dominated by the maximal Cohen-Macaulay R-modules which are not locally free on the punctured spectrum. More precisely, there exists a single R-module X such that the indecomposable maximal Cohen-Macaulay R-modules not locally free on the punctured spectrum are X and its syzygy \Omega X and that any other maximal Cohen-Macaulay R-module is obtained from some extension of X and \Omega X.

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