Morse moves in flow categories Don JonesAndrew LobbDirk Schuetz Indiana University Mathematics Journal 2017 text pdf 10.1512/iumj.2017.66.6136 10.1512/iumj.2017.66.6136 en Indiana Univ. Math. J. 66 (2017) 1603 - 1657 state-of-the-art mathematics http://iumj.org/access/