Abstract:
In the paper, we consider the question as to whether a unital full amalgamated free product of quasidiagonal
C∗-algebras is itself quasidiagonal. We give a sufficient condition for a unital full amalgamated free product of quasidiagonal C∗-algebras with amalgamation over a finite-dimensional C∗-algebra to be quasidiagonal. By applying this result, we conclude that the unital full free product of two AF algebras with amalgamation over a finite-dimensional C∗-algebra is AF if there exists a faithful tracial state on each of the two AF algebras such that the restrictions of these states to the common subalgebra coincide.
Keywords:
quasidiagonal C∗-algebra, unital full amalgamated free product of C∗-algebras.