Groups that act pseudofreely on S2 x S2
Abstract
Recall that a pseudofree group action on a space is one whose singular set consists only of isolated points. In this paper, we classify all of the finite groups which admit pseudofree actions on S2 x S2. The groups turn out to be exactly the expected ones: those which admit orthogonal pseudofree actions on S2 x S2 as a subset of R3 x R3. They are explicitly listed. This paper can be viewed as a companion to a paper of Edmonds, math.GT/9809055.
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