We present a theory of representations of canonical transformations which links together the theories of evolution semigroups, Hamiltonian flows, umbral operators, and cross-sequences. We also present a different approach to the orthogonal theory of moment systems. © 1985.
Gzyl, H. (1985). Canonical transformations, umbral calculus, and orthogonal theory. Journal of Mathematical Analysis and Applications, 111(2), 547–558. https://doi.org/10.1016/0022-247X(85)90234-3