arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.01689math.GT
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流形上光滑函数的Reeb空间

Reeb spaces of smooth functions on manifolds

Osamu Saeki

摘要:

连续函数的Reeb空间是水平集的连通分支空间。本文首先证明了闭流形上具有多个临界值的光滑函数的Reeb空间具有无圈有限图的结构。我们还证明了任意的无圈有限图都可以被实现为闭流形上某个光滑函数的Reeb空间,该空间具有多个临界值,其中相应的水平集也可以被预先指定.最后,我们证明了光滑闭连通流形到有限连通无环图的连续映射(它在基本群之间引起满射)与具有多个临界值的光滑函数到Reeb空间的自然商映射(直到同伦)是一致的.

英文摘要:

The Reeb space of a continuous function is the space of connected components of the level sets. In this paper we first prove that the Reeb space of a smooth function on a closed manifold with finitely many critical values has the structure of a finite graph without loops. We also show that an arbitrary finite graph without loops can be realized as the Reeb space of a certain smooth function on a closed manifold with finitely many critical values, where the corresponding level sets can also be preassigned. Finally, we show that a continuous map of a smooth closed connected manifold to a finite connected graph without loops that induces an epimorphism between the fundamental groups is identified with the natural quotient map to the Reeb space of a certain smooth function with finitely many critical values, up to homotopy.

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