Residual Intersections of $2\times n$ Determinantal Ideals (2207.01143v1)

Published 3 Jul 2022 in math.AC and math.AG

Abstract: Schemes defined by residual intersections have been extensively studied in the case when they are Cohen-Macaulay, but this is a very restrictive condition. In this paper we make the first study of a class of natural examples far from satisfying this condition, the rank 1 loci of generic $2\times n$ matrices. Here we compute their depths and many other properties. These computations require a number of novel tools.

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