A Geometric Criterion for Algebraic Varieties Walter Rudin Indiana University Mathematics Journal 1968 text pdf 10.1512/iumj.1968.17.17042 10.1512/iumj.1968.17.17042 en Indiana Univ. Math. J. 17 (1968) 671 - 683 state-of-the-art mathematics http://iumj.org/access/