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arXiv 0905.1617math.AG
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关于sl(n)中Springer纤维不可约分支的奇异性

On the singularity of the irreducible components of a Springer fiber in sl(n)

Lucas Fresse, Anna Melnikov

摘要:

设${\mathcal B}_u$是幂零自同态$u\in End(\mathbb{C}^n)$上的Springer纤维.设$J(u)$是$u$的Jordan形式,它被看作是$n$的一个划分。${\mathcal B}_u$的不可约分量都是相同维数的。它们被标记为$J(u)$形状的Young tableaux。研究了${\mathcal B}_u$的分支的奇异性问题,证明了${\mathcal B}_u$的所有分支都是非奇异的当且仅当$J(u)\in\{(λ,1,1,...), (λ_1,λ_2), (λ_1,λ_2,1), (2,2,2)\}$ .

英文摘要:

Let ${\mathcal B}_u$ be the Springer fiber over a nilpotent endomorphism $u\in End(\mathbb{C}^n)$. Let $J(u)$ be the Jordan form of $u$ regarded as a partition of $n$. The irreducible components of ${\mathcal B}_u$ are all of the same dimension. They are labelled by Young tableaux of shape $J(u)$. We study the question of singularity of the components of ${\mathcal B}_u$ and show that all the components of ${\mathcal B}_u$ are nonsingular if and only if $J(u)\in\{(λ,1,1,...), (λ_1,λ_2), (λ_1,λ_2,1), (2,2,2)\}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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