Literal Embeddings of Linear Spaces of Operators Edward AzoffH. Shehada Indiana University Mathematics Journal 1993 text pdf 10.1512/iumj.1993.42.42026 10.1512/iumj.1993.42.42026 en Indiana Univ. Math. J. 42 (1993) 571 - 589 state-of-the-art mathematics http://iumj.org/access/