Singularities of nilpotent orbit closures

Singularities of nilpotent orbit closures
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DOI:
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发表时间:
2014-08
期刊:
arXiv: Representation Theory
影响因子:
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通讯作者:
A. Henderson
A. Henderson
中科院分区:
其他
文献类型:
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作者:
A. Henderson

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这是一篇关于复数上单李代数的幂零轨道闭包奇点的说明性文章。它倾向于与表示论有关的方面,包括Maffei关于Slodowy切片与A型Nakajima箭图簇的Maffei定理。有一个新的观察:Juteau和Mautner的结果,结合Maffei定理,给出了Fang,Henke和Koenig关于Schur代数分解数的一个结果的几何证明。
This is an expository article on the singularities of nilpotent orbit closures in simple Lie algebras over the complex numbers. It is slanted towards aspects that are relevant for representation theory, including Maffei's theorem relating Slodowy slices to Nakajima quiver varieties in type A. There is one new observation: the results of Juteau and Mautner, combined with Maffei's theorem, give a geometric proof of a result on decomposition numbers of Schur algebras due to Fang, Henke and Koenig.