Invariant Polynomials and Conjugacy Classes of Real Cartan Subalgebras L. Rothschild Indiana University Mathematics Journal 1972 text pdf 10.1512/iumj.1972.21.21010 10.1512/iumj.1972.21.21010 en Indiana Univ. Math. J. 21 (1972) 115 - 120 state-of-the-art mathematics http://iumj.org/access/