C*-Algebra Extensions and K-Homology. (AM-95), Volume 95

Recent developments in diverse areas of mathematics suggest the study of a certain class of extensions of C*-algebras.

Here, Ronald Douglas uses methods from homological algebra to study this collection of extensions.

He first shows that equivalence classes of the extensions of the compact metrizable space X form an abelian group Ext (X).

Second, he shows that the correspondence X ? Ext (X) defines a homotopy invariant covariant functor which can then be used to define a generalized homology theory.

Establishing the periodicity of order two, the author shows, following Atiyah, that a concrete realization of K-homology is obtained.