超平面截面与Lefschetz性质的微妙之处
Hyperplane sections and the subtlety of the Lefschetz properties
摘要：
弱和强Lefschetz性质是Artin代数可能具有的两个基本性质。这两个Lefschetz属性可以在小的扰动或特征的变化下变化。我们研究这些微妙之处，提出了一个系统的方法变形单项式理想失败的弱Lefschetz属性的理想具有相同的希尔伯特函数和弱Lefschetz属性。特别地，我们将一类Artinian单项理想提升到射影空间中的有限水平点集上，并证明了一般超平面截面在几乎所有特征上都具有弱Lefschetz性质，而特殊超平面截面在任何特征上都不具有弱Lefschetz性质.
英文摘要：
The weak and strong Lefschetz properties are two basic properties that Artinian algebras may have. Both Lefschetz properties may vary under small perturbations or changes of the characteristic. We study these subtleties by proposing a systematic way of deforming a monomial ideal failing the weak Lefschetz property to an ideal with the same Hilbert function and the weak Lefschetz property. In particular, we lift a family of Artinian monomial ideals to finite level sets of points in projective space with the property that a general hyperplane section has the weak Lefschetz property in almost all characteristics, whereas a special hyperplane section does not have this property in any characteristic.
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