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arXiv · 1801.00763

Koszul almost complete intersections

Matthew Mastroeni
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Abstract

Let $R = S/I$ be a quotient of a standard graded polynomial ring $S$ by an ideal $I$ generated by quadrics. If $R$ is Koszul, a question of Avramov, Conca, and Iyengar asks whether the Betti numbers of $R$ over $S$ can be bounded above by binomial coefficients on the minimal number of generators of $I$. Motivated by previous results for Koszul algebras defined by three quadrics, we give a complete classification of the structure of Koszul almost complete intersections and, in the process, give an affirmative answer to the above question for all such rings.

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Matthew Mastroeni. 2018-01-02. Koszul almost complete intersections. https://arxiv.org/abs/1801.00763

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