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arXiv math/0609422math.AG
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关于约化Borel-Serre紧化,II:偏心等价和最小公共修改

On the reductive Borel-Serre compactification, II: Excentric quotients and least common modifications

Steven Zucker

摘要:

设X是局部对称簇。设EBS(X)和TorE(X)分别表示它的偏心Borel-Serre紧化和偏心环面紧化。我们确定他们的最小共同修改,并用它来证明一个猜想Goresky和泰关于典型的扩张齐次向量丛。在这个过程中,我们看到EBS(X)和TorE(X)是同伦等价的。

英文摘要:

Let X be a locally symmetric variety. Let EBS(X) and TorE(X) denote its excentric Borel-Serre and excentric toroidal compactifications, resp. We determine their least common modification and use it to prove a conjecture of Goresky and Tai concerning canonical extensions of homogeneous vector bundles. In the process, we see that EBS(X) and TorE(X) are homotopy equivalent.

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