Ext classes and embeddings for -algebras of graphs with sinks.
Continuity of ring -homomorphisms between -algebras.
Adding tails to -correspondences.
Ultragraph C*-algebras via topological quivers
Given an ultragraph in the sense of Tomforde, we construct a topological quiver in the sense of Muhly and Tomforde in such a way that the universal C*-algebras associated to the two objects coincide. We apply results of Muhly and Tomforde for topological quiver algebras and of Katsura for topological graph C*-algebras to study the K-theory and gauge-invariant ideal structure of ultragraph C*-algebras.
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