Manoj Kummini

  1. Poset Embeddings of Hilbert Functions.

    Authors: Manoj Kummini, Giulio Caviglia
    Subjects: Commutative Algebra
    Abstract

    For a standard graded algebra $R$, we consider embeddings of the the poset of
    Hilbert functions of quotients of $R$ into the poset of ideals of $R$, as a way
    of classification of Hilbert functions. There are examples of rings for which
    such embeddings do not exist. We describe how the embedding can be lifted to
    certain ring extensions, which is then used in the case of polarization and
    distraction. A version of a theorem of Clements--Lindstr\"om is proved.

  2. Dependence of Betti Numbers on Characteristic.

    Authors: Kia Dalili, Manoj Kummini
    Subjects: Commutative Algebra
    Abstract

    We study the dependence of graded Betti numbers of monomial ideals on the
    characteristic of the base field. The examples we describe include bipartite
    ideals, Stanley--Reisner ideals of vertex-decomposable complexes and ideals
    with componentwise linear resolutions. We give a description of bipartite
    graphs and, using discrete Morse theory, provide a way of looking at the
    homology of arbitrary simplicial complexes through bipartite ideals.

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