On Hamiltonian flows on Euler-type equations

Abstract

Properties of Hamiltonian symmetry flows on hyperbolic Euler-type Liouvillean equations E' are analyzed. Description of their Noether symmetries assigned to the integrals for these equations is obtained. The integrals provide Miura transformations from E' to the multi-component wave equations E. By using these substitutions, we generate an infinite-Hamiltonian commutative subalgebra A of local Noether symmetry flows on E proliferated by weakly nonlocal recursion operators. We demonstrate that the correlation between the Magri schemes for A and for the induced "modified" Hamiltonian flows B in the symmetry algebra of E' is such that these properties are transferred to B and the recursions for E' are factorized. Two examples associated with the 2D Toda lattice are considered.