On finite Galois coverings of projective manifolds

On finite Galois coverings of projective manifolds
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关于射影流形的有限伽罗瓦覆盖

DOI:
10.2969/jmsj/04130391
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发表时间:
1989
影响因子:
0.7
通讯作者:
M. Namba
M. Namba
中科院分区:
数学4区
文献类型:
--
作者:
M. Namba

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所谓射影流形,是指可以全纯嵌入到复射影空间中的连通紧复流形 $P^{m}$ 对一些人来说 $m\geqq 1$ . 让 $M$ 是一个射影流形。的有限分支覆盖(或简单的有限覆盖) $M$ 根据定义是一个不可约的正规复空间吗 $X$ 与一个满射固有有限全纯映射一起 $\pi;Xarrow M$. 在这种情况下, $X$ 也是格劳尔特b[3]的投影。态射(如:的同构 $\pi;Xarrow M$ 到另一个有限覆盖 $\pi’$ : $X’arrow M$ 根据定义,它是全纯的。生物全纯映射 $\phi:Xarrow X’$ 这样 $\pi’\cdot\phi=\pi$ . 布景 $G_{\pi}$ 的所有自同构 $\pi:Xarrow M$ 在复合下形成群,称为的自同构群 $\pi:Xarrow M$. G.作用于…的每一根纤维 $\pi$ .
By a Projective manifold, we mean a connected compact complex manifold which can be imbedded holomorphically into the complex projective space $P^{m}$ for some $m\geqq 1$ . Let $M$ be a projective manifold. A finite branched covering (or simply a finite covering) of $M$ is by definition an irreducible normal complex space $X$ together with a surjective proper finite holomorphic mapping $\pi;Xarrow M$. In this case, $X$ is also projective by Grauert [3]. A morphism(resp. an isomorphjsm) of $\pi;Xarrow M$ to another finite covering $\pi’$ : $X’arrow M$ is by definition a holomorphic (resp. biholomorphic) mapping $\phi:Xarrow X’$ such that $\pi’\cdot\phi=\pi$ . The set $G_{\pi}$ of all automorphisms of $\pi:Xarrow M$ forms a group under composition and is called the automorphism group of $\pi:Xarrow M$. G. acts on each fiber of $\pi$ .