On the Theory of General Geometrodynamics Shoji Watanabe Indiana University Mathematics Journal 1963 text pdf 10.1512/iumj.1963.12.12057 10.1512/iumj.1963.12.12057 en Indiana Univ. Math. J. 12 (1963) 831 - 846 state-of-the-art mathematics http://iumj.org/access/