On the linear span of the projections in certain simple C*-algebras L. Marcoux Indiana University Mathematics Journal 2002 text pdf 10.1512/iumj.2002.51.2123 10.1512/iumj.2002.51.2123 en Indiana Univ. Math. J. 51 (2002) 753 - 771 state-of-the-art mathematics http://iumj.org/access/