Abstract:
Let X be a quasi-projective scheme and ℱ a coherent sheaf of modules over X such that its non-Cohen–Macaulay locus is at most one dimensional. We use and extend the techniques of Brodmann to construct proper birational morphisms of quasi-projective schemes f:Y→X and Cohen–Macaulay coherent sheaves of modules over Y that are isomorphic to the pull-back of ℱ away from the exceptional locus of f. Certain blow-ups of X at locally complete intersections subschemes which contain non-reduced scheme structures on the non-Cohen–Macaulay locus of ℱ are the main part of the construction.
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Received: 19 February 1998 / Revised version: 28 December 1998
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Mordasini, F. On Macaulayfication of sheaves. manuscripta math. 99, 443–464 (1999). https://doi.org/10.1007/s002290050184
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DOI: https://doi.org/10.1007/s002290050184