Witnesses, Transgressions, and the Evaluation Map Daniel Gottlieb Indiana University Mathematics Journal 1975 text pdf 10.1512/iumj.1975.24.24065 10.1512/iumj.1975.24.24065 en Indiana Univ. Math. J. 24 (1975) 825 - 836 state-of-the-art mathematics http://iumj.org/access/