2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/76849Every AF-algebra arises as a graph algebra in the sense of Kumjian, Pask, Raeburn, and Renault. For AF-algebras, the diagonal subalgebra defined by Stratila and Voiculescu is consistent with Kumjian's notion of diagonal, and the groupoid arising from a well-chosen Bratteli diagram for A coincides with Kumjian's twist groupoid constructed from a diagonal of A.11 pages LaTeX. Uses pb-diagram.styOperator Algebrastext