An Extension of the Frobenius Group Commutator Theorem C. DePrimaB. Richard Indiana University Mathematics Journal 1974 text pdf 10.1512/iumj.1974.23.23021 10.1512/iumj.1974.23.23021 en Indiana Univ. Math. J. 23 (1974) 251 - 255 state-of-the-art mathematics http://iumj.org/access/