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arXiv 2202.07018math.GT
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曲面上的奇异纤维化

Singular fibrations over surfaces

Louis Funar

AI总结:

本文研究了4维流形在曲面上的奇异纤维化,介绍了单奇点构造与$S^4$的Matsumoto构造,并证明第一Betti数较大且第二Betti数为零的闭可定向4维流形不存在奇异纤维化。

摘要:

奇异纤维化推广了4维流形在曲面上的非手性Lefschetz纤维化,同时保留了它们的一些性质。例如,相对极小的奇异纤维化由其单值性决定。我们解释了如何构造具有单一奇点的奇异纤维化示例,以及Matsumoto关于球面$S^4$的奇异纤维化构造。文中还概述了Hirzebruch和Hopf关于具有有限多个奇点的2-平面场的结果,并将其与Neumann和Rudolph关于Hopf不变量的工作联系起来。最后,我们证明具有较大第一Betti数且第二Betti数为零的闭可定向4维流形不存在奇异纤维化。

英文摘要:

Singular fibrations generalize achiral Lefschetz fibrations of 4-manifolds over surfaces while sharing some of their properties. For instance, relatively minimal singular fibrations are determined by their monodromy. We explain how to construct examples of singular fibrations with a single singularity and Matsumoto's construction of singular fibrations of the sphere $S^4$. Previous results of Hirzebruch and Hopf on 2-plane fields with finitely many singularities are outlined in connection with the work of Neumann and Rudolph on the Hopf invariant. Eventually, we prove that closed orientable 4-manifolds with large first Betti number and vanishing second Betti number do not admit singular fibrations.

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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