The Elementary Basic Principles of the Unified Theory of Relativity. B_2 Vaiclav Hlavaty Indiana University Mathematics Journal 1955 text pdf 10.1512/iumj.1955.4.54009 10.1512/iumj.1955.4.54009 en Indiana Univ. Math. J. 4 (1955) 247 - 277 state-of-the-art mathematics http://iumj.org/access/