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arXiv 2203.01258math.ACmath.AG
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余维为3的Artin Gorenstein代数的Lefschetz性质

Lefschetz properties of some codimension three Artinian Gorenstein algebras

Nancy Abdallah, Nasrin Altafi, Anthony Iarrobino, Alexandra Seceleanu, Joachim Yaméogo

摘要:

余维2Artinian代数$A$具有强和弱Lefschetz性质,只要特征为零或大于基座度.这是开放的程度,这样的结果可能会扩大到余维3 AG代数-最有前途的结果,到目前为止,有关弱Lefschetz性质,这样的代数。我们证明了每个标准分次余维3的Artin Gorenstein代数$A$具有较低的Hilbert函数的最大值-至多6-具有强Lefschetz性质,只要特征为零。当特征大于$A$的柱脚度时,我们证明了$A$几乎是强Lefschetz的.这个相当温和的结果,但可以说是最广泛的迄今为止关于强Lefschetz性质分次余维3 AG代数。

英文摘要:

Codimension two Artinian algebras $A$ have the strong and weak Lefschetz properties provided the characteristic is zero or greater than the socle degree. It is open to what extent such results might extend to codimension three AG algebras - the most promising results so far have concerned the weak Lefschetz property for such algebras. We here show that every standard-graded codimension three Artinian Gorenstein algebra $A$ having low maximum value of the Hilbert function - at most six - has the strong Lefschetz property, provided that the characteristic is zero. When the characteristic is greater than the socle degree of $A$, we show that $A$ is almost strong Lefschetz. This quite modest result is nevertheless arguably the most encompassing so far concerning the strong Lefschetz property for graded codimension three AG algebras.

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