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arXiv 2202.09349math.AG
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奇异曲线的最大Noether定理

Max Noether Theorem for Singular Curves

Edson Martins Gagliardi, Renato Vidal Martins

摘要:

Max Noether定理断言,如果$ω$是非奇异非超椭圆射影曲线的对偶层,则自然态射$\text{Sym}^nH^0(ω)\to H^0(ω^n)$对所有$n\geq 1$都是满射。许多不同的作者以不同的方式将该结果扩展到Gorenstein曲线。最近,它被证明为曲线与射影正常的典型模型,曲线的非Gorenstein点是双分支在更坏的。在此基础上,我们讨论了一般情况下的组合数学,并将结果推广到任意积分曲线。

英文摘要:

Max Noether's Theorem asserts that if $ω$ is the dualizing sheaf of a nonsingular nonhyperelliptic projective curve, then the natural morphisms $\text{Sym}^nH^0(ω)\to H^0(ω^n)$ are surjective for all $n\geq 1$. The result was extended for Gorenstein curves by many different authors in distinct ways. More recently, it was proved for curves with projectively normal canonical models, and curves whose non-Gorenstein points are bibranch at worse. Based on those works, we address the combinatorics of the general case and extend the result for any integral curve.

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