Translation-Invariant Borel Liftings Hardly Ever Exist Joseph KupkaKarel Prikry Indiana University Mathematics Journal 1983 text pdf 10.1512/iumj.1983.32.32047 10.1512/iumj.1983.32.32047 en Indiana Univ. Math. J. 32 (1983) 717 - 731 state-of-the-art mathematics http://iumj.org/access/