Local Analytic Isometric Deformations H. Jacobowitz Indiana University Mathematics Journal 1982 text pdf 10.1512/iumj.1982.31.31006 10.1512/iumj.1982.31.31006 en Indiana Univ. Math. J. 31 (1982) 47 - 55 state-of-the-art mathematics http://iumj.org/access/