Semifree actions on finite groups on homotopy spheres

Ewing, John

doi:10.1090/S0002-9947-1978-0511421-3

Semifree actions on finite groups on homotopy spheres
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Trans. Amer. Math. Soc. 245 (1978), 431-442 Request permission

Abstract:

We show that for any finite group the group of semifree actions on homotopy spheres of some fixed even dimension is finite, provided that the dimension of the fixed point set is greater than 2. The argument shows that for such an action the normal bundle to the fixed point set is equivariantly, stably trivial.

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Spherelike G-manifolds with exotic equivariant tangent bundles

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