A spectral mapping theorem and invariant manifolds for nonlinear Schrodinger equations F. GesztesyChristopher JonesY. LatushkinM. Stanislavova 35Q5547D0347D06nonlinear Schrodinger equationcenter manifoldssemigroupsspectral mapping theorem Indiana University Mathematics Journal 2000 text pdf 10.1512/iumj.2000.49.1838 10.1512/iumj.2000.49.1838 en Indiana Univ. Math. J. 49 (2000) 221 - 244 state-of-the-art mathematics http://iumj.org/access/