Correction 'Some results of Chern-do Carmo-Kobayashi Type and the Length of Second Fundamental Form' Bin Chen Indiana University Mathematics Journal 1973 text pdf 10.1512/iumj.1973.22.22033 10.1512/iumj.1973.22.22033 en Indiana Univ. Math. J. 22 (1973) 399 - 399 state-of-the-art mathematics http://iumj.org/access/