Mathematics – Operator Algebras
Scientific paper
2005-01-26
Mathematics
Operator Algebras
LaTeX, 6 pages
Scientific paper
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 \emph{unital} semi-split extensions of $A$ by $B$. The six-terms exact sequence is an unpublished result of G. Skandalis.
Manuilov Vladimir
Thomsen Klaus
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