Abstract
The paper deals with the correlated concepts of cofibration and bicofibration in C*-algebra theory. We study cobrations of C*-algebras introduced by Claude Schochet in [9] (see also [7]). Cofibrations are characterized by means of the mapping cylinder C*-algebras. We also dene and analyse the notion of bicofibration for C*-algebras based on the topological model from [8] (see also [5]). As an application, an exact sequence of Cerin's homotopy groups [1] is obtained.
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