On the Cesaro Operator Thomas KrieteDavid Trutt Indiana University Mathematics Journal 1975 text pdf 10.1512/iumj.1975.24.24017 10.1512/iumj.1975.24.24017 en Indiana Univ. Math. J. 24 (1975) 197 - 214 state-of-the-art mathematics http://iumj.org/access/