The graph C*-algebra classification conjecture by filtered ordered K-theory

Let EE be a graph and let C(E)C^*(E) be its graph CC^*-algebra. Suppose that C(E)C^*(E) has finitely many ideals, and write FKPrim(C(E))+(C(E)){\mathsf{FK}^+_{\operatorname{Prim}(C^*(E))}\left(C^*(E)\right)} for its filtered, ordered KK-theory. Graph C-algebra classification conjecture.* Graph CC^*-algebras C(E)C^*(E) with finitely many ideals are classified up to stable isomorphism by their filtered, ordered KK-theory FKPrim(C(E))+(C(E)){\mathsf{FK}^+_{\operatorname{Prim}(C^*(E))}\left(C^*(E)\right)}. The conjecture is a proposed classification of graph CC^*-algebras by KK-theoretical invariants. It remains open, and some results suggest that an additional condition of finitely generated KK-theory may be necessary.

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Primary source

Søren Eilers, Gunnar Restorff and Efren Ruiz, “Classification of graph C*-algebras with no more than four primitive ideals”, arXiv:1212.6750 (2012).

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