某些高阶Euler类的无界性
Unboundedness of some higher Euler classes
摘要:
本文研究了Seifert纤维3-流形的同胚群中的Euler类。我们发现,在熟悉的欧拉类$\mathrm{Homeo}_0(S^1)^δ$,这些欧拉类$\mathrm{Homeo}_0(M^3)^δ$是无界类。事实上,我们给出了亏格为3的曲面上的平坦拓扑M丛的例子,其Euler类取任意值。
英文摘要:
In this paper, we study Euler classes in groups of homeomorphisms of Seifert fibered 3-manifolds. We show that, in contrast to the familiar Euler class for $\mathrm{Homeo}_0(S^1)^δ$, these Euler classes for $\mathrm{Homeo}_0(M^3)^δ$ are unbounded classes. In fact, we give examples of flat topological M bundles over a genus 3 surface whose Euler class takes arbitrary values.
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