The Group of Unital C*-extensions
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Let A and B be separable C*-algebras, A unital and B stable. It is shown that there is a natural six-terms exact sequence which relates the group which arises by considering all semi-split extensions of A by B to the group which arises by restricting the attention to unital semi-split extensions of A by B. The six-terms exact sequence is an unpublished result of G. Skandalis.
KeywordsC*-algebra extension unital extension absorbing homomorphism
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