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
中科院分区:
文献类型:
--
作者:
D. Montgomery;C. T. Yang
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.