Fixed set systems of equivariant infinite loop spaces

Costenoble, Steven R.; Waner, Stefan

doi:10.1090/S0002-9947-1991-1012523-4

Fixed set systems of equivariant infinite loop spaces
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Trans. Amer. Math. Soc. 326 (1991), 485-505 Request permission

Abstract:

We develop machinery enabling us to show that suitable $G$-spaces, including the equivariant version of $BF$, are equivariant infinite loop spaces. This involves a "recognition principle" for systems of spaces which behave formally like the system of fixed sets of a $G$-space; that is, we give a necessary and sufficient condition for such a system to be equivalent to the fixed set system of an equivariant infinite loop space. The advantage of using the language of fixed set systems is that one can frequently replace the system of fixed sets of an actual $G$-space by an equivalent formal system which is considerably simpler, and which admits the requisite geometry necessary for delooping. We also apply this machinery to construct equivariant Eilenberg-Mac Lane spaces corresponding to Mackey functors.

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Three topological categories of

spaces