  In 1976, D. Voiculescu proved that every separable unital sub-C*-algebra of
the Calkin algebra is equal to its (relative) bicommutant. In his minicourse
(see reference), G. Pedersen asked in 1988 if Voiculescu's theorem can be
extended to a simple corona algebra of a $\sigma$-unital C*-algebra. In this
note, we answer Pedersen's question for a stable $\sigma$-unital C*-algebra.

Operator Algebras;Functional Analysis;K-Theory and Homology