Published online by Cambridge University Press: 20 November 2018
It is shown that a separable ${{C}^{*}}$-algebra is inner quasidiagonal if and only if it has a separating family of quasidiagonal irreducible representations. As a consequence, a separable
${{C}^{*}}$-algebra is a strong
$\text{NF}$ algebra if and only if it is nuclear and has a separating family of quasidiagonal irreducible representations. We also obtain some permanence properties of the class of inner quasidiagonal
${{C}^{*}}$-algebras.