Displaying similar documents to “Ext classes and embeddings for C * -algebras of graphs with sinks.”

Ideal extensions of graph algebras

Karla Čipková (2006)

Czechoslovak Mathematical Journal

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Let 𝒜 and be graph algebras. In this paper we present the notion of an ideal in a graph algebra and prove that an ideal extension of 𝒜 by always exists. We describe (up to isomorphism) all such extensions.

Unital extensions of A F -algebras by purely infinite simple algebras

Junping Liu, Changguo Wei (2014)

Czechoslovak Mathematical Journal

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In this paper, we consider the classification of unital extensions of A F -algebras by their six-term exact sequences in K -theory. Using the classification theory of C * -algebras and the universal coefficient theorem for unital extensions, we give a complete characterization of isomorphisms between unital extensions of A F -algebras by stable Cuntz algebras. Moreover, we also prove a classification theorem for certain unital extensions of A F -algebras by stable purely infinite simple C * -algebras...