Mathematics – Operator Algebras
Scientific paper
2010-10-15
Mathematics
Operator Algebras
10 pages
Scientific paper
For a countable discrete space V, every nondegenerate separable C*-correspondence over c_0(V) is isomorphic to one coming from a directed graph with vertex set V. In this paper we demonstrate why the analogous characterizations fail to hold for higher-rank graphs (where one considers product systems of C*-correspondences) and for topological graphs (where V is locally compact Hausdorff), and we discuss the obstructions that arise.
Kaliszewski S.
Patani Nura
Quigg John
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