Alexandra Seceleanu

  1. Ideals with Larger Projective Dimension and Regularity.

    Authors: Alexandra Seceleanu, Jesse Beder, Jason McCullough, Luis Nunez-Betancourt, Bart Snapp, Branden Stone
    Subjects: Commutative Algebra
    Abstract

    We define a family of homogeneous ideals with large projective dimension and
    regularity relative to the number of generators and their common degree. This
    family subsumes and improves upon constructions given in [Cav04] and [McC]. In
    particular, we describe a family of three-generated homogeneous ideals in
    arbitrary characteristic whose projective dimension grows asymptotically as
    sqrt{d}^(sqrt(d) - 1).

  2. The Weak Lefschetz Property and powers of linear forms in K[x,y,z].

    Authors: Hal Schenck, Alexandra Seceleanu
    Subjects: Commutative Algebra
    Abstract

    We show that an Artinian quotient of K[x, y, z] by an ideal I generated by
    powers of linear forms has the Weak Lefschetz property. If the syzygy bundle of
    I is semistable this follows from results of Brenner-Kaid; our proof works
    without this hypothesis, which typically does not hold.

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