Some 3-manifold groups with the same finite quotients

Some 3-manifold groups with the same finite quotients
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一些具有相同有限商的 3 流形群

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发表时间:
2014
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通讯作者:
J. Hempel
J. Hempel
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作者:
J. Hempel

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我们给出了闭的有向的3流形的例子,它们的基本群不同构,但有相同的有限商群集合;因此同样是无限完成。我们还给出了具有非空边界的紧定向3流形的例子,它们的基本群虽然同构,但具有不同的外围结构,但具有相同的有限外围对商集合(定义如下)。例子有:零有理欧拉数的Seifert纤维空间;此外,这些流形中的大多数都会产生这样的例子。
We give examples of closed, oriented 3-manifolds whose fundamental groups are not isomorphic, but yet have the same sets of finite quotient groups; hence the same profinite completions. We also give examples of compact, oriented 3-manifolds with non-empty boundaries whose fundamental groups though isomorphic have distinct peripheral structures, but yet have the same sets of finite peripheral pair quotients (defined below). The examples are Seifert Fibered Spaces with zero rational Euler number; moreover most of these manifolds give rise to such examples.