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Anisotropy, biased pairings, and the Lefschetz property for pseudomanifolds and cycles

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arxiv 2101.07245 v2 pith:DKH5HUCL submitted 2021-01-18 math.CO math.ACmath.AGmath.AT

classification math.COmath.ACmath.AGmath.AT
keywords characteristiccycleslefschetzpseudomanifoldsbiasedgeneralizationpropertyprove
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We prove the hard Lefschetz property for pseudomanifolds and cycles in any characteristic with respect to an appropriate Artinian reduction. The proof is a combination of Adiprasito's biased pairing theory and a generalization of a formula of Papadakis-Petrotou to arbitrary characteristic. In particular, we prove the Lefschetz theorem for doubly Cohen Macaulay complexes, solving a generalization of the g-conjecture due to Stanley. We also provide a simplified presentation of the characteristic 2 case, and generalize it to pseudomanifolds and cycles.

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  1. On the weak and strong Lefschetz properties for initial ideals of determinantal ideals with respect to diagonal monomial orders

    math.AC 2025-06 conditional novelty 7.0 of 10

    For initial ideals of determinantal ideals with respect to diagonal monomial orders, the author proves SLP for maximal minors and WLP failure for non-maximal minors when mn is large enough.

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