On endomorphisms of projective bundles

On endomorphisms of projective bundles
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关于射影丛的自同态

DOI:
10.1007/s00229-002-0347-z
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发表时间:
2002
影响因子:
0.6
通讯作者:
E. Amerik
E. Amerik
中科院分区:
数学4区
文献类型:
--
作者:
E. Amerik

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设X是一个射影丛。我们证明了X允许一个次数>1的自同态,且与到基的投影交换,当且仅当X在有限覆盖后平凡化。当X是秩为2的向量矩阵E的射影化时,我们证明了X在一般纤维上有次数>1的自同态,仅当E在有限基变换后分裂。
LetXbe a projective bundle. We prove thatXadmits an endomorphism of degree >1 and commuting with the projection to the base, if and only ifXtrivializes after a finite covering. WhenXis the projectivization of a vector bundleEof rank 2, we prove that it has an endomorphism of degree >1 on a general fiber only ifEsplits after a finite base change.