Homotopy of product systems and K-theory of Cuntz-Nica-Pimsner algebras

  title={Homotopy of product systems and K-theory of Cuntz-Nica-Pimsner algebras},
  author={James Fletcher and Elizabeth A. Gillaspy and Aidan Sims},
  journal={Indiana University Mathematics Journal},
We introduce the notion of a homotopy of product systems, and show that the Cuntz-Nica-Pimsner algebras of homotopic product systems over N^k have isomorphic K-theory. As an application, we give a new proof that the K-theory of a 2-graph C*-algebra is independent of the factorisation rules, and we further show that the K-theory of any twisted k-graph C*-algebra is independent of the twisting 2-cocycle. We also explore applications to K-theory for the C*-algebras of single-vertex k-graphs… 
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