A note on cyclic gradients Dan Voiculescu Indiana University Mathematics Journal 2000 text pdf 10.1512/iumj.2000.49.2077 10.1512/iumj.2000.49.2077 en Indiana Univ. Math. J. 49 (2000) 837 - 842 state-of-the-art mathematics http://iumj.org/access/