Two Notes on Reductions of Ideals L. Ratliff, Jr.David Rush Indiana University Mathematics Journal 1978 text pdf 10.1512/iumj.1978.27.27062 10.1512/iumj.1978.27.27062 en Indiana Univ. Math. J. 27 (1978) 929 - 934 state-of-the-art mathematics http://iumj.org/access/