Displaying similar documents to “A characterization of the algebra of holomorphic functions on simply connected domain.”

Ultragraph C*-algebras via topological quivers

Takeshi Katsura, Paul S. Muhly, Aidan Sims, Mark Tomforde (2008)

Studia Mathematica

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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.

A note on the singular spectrum.

L. Lindeboom (Groenewald), H. Raubenheimer (1998)

Extracta Mathematicae

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We compare the singular spectrum of a Banach algebra element with the usual spectrum and exponential spectrum.