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arXiv 0810.1353math.ACmath.CO
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加权树的Gorenstein半群代数

Gorenstein Semigroup Algebras of Weighted Trees

Christopher Manon

摘要:

当复曲面代数$\C[S_{\tree}(\br)]$是Gorenstein时,我们对它进行了精确的分类.这些代数作为$\mathbb{P}^{n-3}$上$n-1$点爆破的Cox-Nagata环的不变量代数的环面变形而出现,或者等价地,作为格拉斯曼$Gr_2(\C^n)$权簇的Plücker嵌入的整体瓣环的代数,以及作为$\mathbb{P}^1$上权点模嵌入的整体瓣代数。作为一个推论,我们确切地发现,当这些家庭的环是Gorenstein以及。

英文摘要:

We classify exactly when the toric algebras $\C[S_{\tree}(\br)]$ are Gorenstein. These algebras arise as toric deformations of algebras of invariants of the Cox-Nagata ring of the blow-up of $n-1$ points on $\mathbb{P}^{n-3}$, or equivalently algebras of the ring of global sections for the Plücker embedding of weight varieties of the Grassmanian $Gr_2(\C^n)$, and algebras of global sections for embeddings of moduli of weighted points on $\mathbb{P}^1$. As a corollary, we find exactly when these families of rings are Gorenstein as well.

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