Solution of the Neumann problem on a non-smooth domain Dariush Ehsani 32W0535B65d-bar Neumannnon-smooth domains Indiana University Mathematics Journal 2003 text pdf 10.1512/iumj.2003.52.2261 10.1512/iumj.2003.52.2261 en Indiana Univ. Math. J. 52 (2003) 629 - 666 state-of-the-art mathematics http://iumj.org/access/