Three Bimodules for Mansfield's Imprimitivity Theorem

Details Three Bimodules for Mansfield's Imprimitivity Theorem Three Bimodules for Mansfield's Imprimitivity Theorem

2000-02-04

arxiv.org/abs/math/0002038v1

Mathematics

Operator Algebras

LaTeX-2e, 20 pages, uses packages amssymb, xy, upref

Scientific paper

There are at least three imprimitivity bimodules naturally associated to a maximal coaction of a discrete group G on a C*-algebra and a normal subgroup of G: Mansfield's bimodule; the bimodule assembled by Ng from Green's imprimitivity bimodule and Katayama duality; and a bimodule assembled from Green's bimodule and a crossed-product Mansfield bimodule. We show that all three of these are isomorphic, so that the corresponding inducing maps on representations are identical. This can be interpreted as saying that Mansfield and Green induction are inverses of one another ``modulo Katayama duality''. These results pass to twisted coactions; dual results starting with an action are also given.

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