Israel Journal of Mathematics

, Volume 193, Issue 1, pp 399–440 | Cite as

Co-universal C*-algebras associated to generalised graphs

  • Nathan Brownlowe
  • Aidan Sims
  • Sean T. Vittadello
Article

Abstract

We introduce P-graphs, which are generalisations of directed graphs in which paths have a degree in a semigroup P rather than a length in ℕ. We focus on semigroups P arising as part of a quasi-lattice ordered group (G, P) in the sense of Nica, and on P-graphs which are finitely aligned in the sense of Raeburn and Sims. We show that each finitely aligned P-graph admits a C*-algebra C*min (Λ) which is co-universal for partialisometric representations of Λ which admit a coaction of G compatible with the P-valued length function. We also characterise when a homomorphism induced by the co-universal property is injective. Our results combined with those of Spielberg show that every Kirchberg algebra is Morita equivalent to C*min (Λ) for some (ℕ2* ℕ)-graph Λ.

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Copyright information

© Hebrew University Magnes Press 2012

Authors and Affiliations

  • Nathan Brownlowe
    • 1
  • Aidan Sims
    • 1
  • Sean T. Vittadello
    • 1
  1. 1.School of Mathematics and Applied StatisticsUniversity of WollongongWollongongAustralia

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