Hyperinvariant subspaces for compact perturbations of operators whose spectrum has a Dini-smooth exposed arc I. Chalendar Hilbert spacesDini-smooth archyperinvariant subspacesinvariant spaces Indiana University Mathematics Journal 1997 text pdf 10.1512/iumj.1997.46.1291 10.1512/iumj.1997.46.1291 en Indiana Univ. Math. J. 46 (1997) 1125 - 1136 state-of-the-art mathematics http://iumj.org/access/