Commutators in Ideals of Trace Class Operators II J. Anderson Indiana University Mathematics Journal 1986 text pdf 10.1512/iumj.1986.35.35022 10.1512/iumj.1986.35.35022 en Indiana Univ. Math. J. 35 (1986) 373 - 378 state-of-the-art mathematics http://iumj.org/access/