47 citations · 47 across the 1 of their papers we have counts for
2 papers
nlin.SI2003★ 47 cited
Umbral Calculus, Difference Equations and the Discrete Schroedinger Equation
Decio Levi, Piergiulio Tempesta, Pavel Winternitz
We discuss umbral calculus as a method of systematically discretizing linear differential equations while preserving their point symmetries as well as generalized symmetries. The m…
hep-th1999
Non-local Symmetries of Nonlinear Field Equations: an Algebraic Approach
M. Leo, R. A. Leo, G. Soliani +1
An algebraic method is devised to look for non-local symmetries of the pseudopotential type of nonlinear field equations. The method is based on the use of an infinite-dimensional…