Differentiable pseudo-free circle actions.

Differentiable pseudo-free circle actions.
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可微的伪自由圆动作。

DOI:
10.1073/pnas.68.5.894
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发表时间:
1971
影响因子:
11.1
通讯作者:
C. T. Yang
C. T. Yang
中科院分区:
综合性期刊1区
文献类型:
--
作者:
D. Montgomery;C. T. Yang

文献摘要

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圆群G是伪自由的,如果它不是自由的,如果每个轨道都是一维的,如果各向同性群是恒等的,除了在孤立的特殊轨道上各向同性群是有限循环群Z(k) k > 1。我们考虑了同伦七球上的这类可微作用,并对它们进行了分类。作为一个推论,它可以有任何有限数量的例外轨道,而不是线性的情况,最多只能有四个。
The circle group G is said to act pseudofreely if it is not free and if every orbit is one-dimensional and if the isotropy group is the identity except on isolated exceptional orbits where the isotropy group is the finite cyclic group Z(k), k > 1. We consider differentiable actions of this kind on homotopy seven spheres and classify all such actions. As a corollary, it follows that there can be any finite number of exceptional orbits, in contrast to the linear case where there can be at most four.