COVERINGS OF SKEW-PRODUCTS AND CROSSED PRODUCTS BY COACTIONS.

Consider a projective limit G of finite groups Gn. Fix a compatible family δn of coactions of the Gn on a C*-algebra A. From this data we obtain a coaction eδ of G on A. We show that the coaction crossed product of A by δ is isomorphic to a direct limit of the coaction crossed products of A by the δn. If A D C* (Λ) for some k-graph Λ, and if the coactions δn correspond to skew-products of Λ, then we can say more. We prove that the coaction crossed product of C* (Λ) by δ may be realized as a full corner of the C*-algebra of a (k + 1)-graph. We then explore connections with Yeend's topological higher-rank graphs and their C*-algebras. [ABSTRACT FROM AUTHOR]