A Homotopy Group of Algebraic Arcs Found by Smoothed Approximations Paul Cherenack Indiana University Mathematics Journal 1969 text pdf 10.1512/iumj.1969.18.18081 10.1512/iumj.1969.18.18081 en Indiana Univ. Math. J. 18 (1969) 1101 - 1117 state-of-the-art mathematics http://iumj.org/access/