Abstract
We study projective modules in the category of functors from homogeneous spaces into abelian groups. Such functors have been considered by Bredon [1]. We show that protective functors are determined by a set of ordinary projective modules over suitable group rings. The general notions are applied to give a quick proof for the product formula of the finiteness obstruction for transformation groups. These finiteness obstructions are straightforward extensions of the Swan-Wall obstructions (see e. g. Quinn [7]). They are important in the study of homotopy representations (tom Dieck — Petrie [3], [4]). This work is also related to Rothenberg [8].
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tom Dieck, T. Über projektive Moduln und Endlichkeitshindernisse bei Transformationsgruppen. Manuscripta Math 34, 135–155 (1981). https://doi.org/10.1007/BF01165533
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DOI: https://doi.org/10.1007/BF01165533