A Fredholm Operator Approach To Morita Equivalence
Ruy Exel
Abstract
Given C*-algebras A and B and an imprimitivity A-B-bimodule X, we construct an explicit isomorphism X* : Ki(A) --> Ki(B) where Ki denote the complex K-theory functors for i=0, 1. Our techniques do not require separability nor existence of countable approximate identities. We thus extend, to general C*-algebras, the result of Brown, Green and Rieffel according to which strongly Morita equivalent C*-algebras have isomorphic K-groups. The method employed includes a study of Fredholm operators on Hilbert modules.
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