K-Theory of the Commutator Ideal
Résumé
We consider for unital C∗-algebras the short exact sequence
0 → 1 → A ∗C B → A ⊗max B → 0
and give an explicit formula for the boundary map for separable C∗-algebras for which the K¨unneth formula for tensor products holds without Tor-terms. In the course of the article, we study the similar case of an ideal concerning one-relator groups.