Removing sources from higher-rank graphs

Abstract

For a higher-rank graph $Λ$ with sources we detail a construction that creates a higher-rank graph $\barΛ$ that does not have sources and contains $Λ$ as a subgraph. Furthermore, when $Λ$ is row-finite, the Cuntz-Krieger algebra of $Λ$ is a full corner of $C^*(\barΛ)$, the Cuntz-Krieger algebra of $\barΛ$.