Algebro-geometric Constructions of a Hierarchy of Integrable Semi-discrete Equations

Abstract

A hierarchy of integrable semi-discrete equations is deduced in terms of the discrete zero curvature equation as well as its bi-Hamiltonian structure is gotten through the trace identity. The above hierarchy is separated into soluble ordinary differential equations according to the relationship between the elliptic variables and the potentials, from which the continuous flow is straightened out via the Abel–Jacobi coordinates resorting to the algebraic curves theory. Eventually, the meromorphic function and the Baker–Akhiezer function are introduced successively on the hyperelliptic curve and the algebro-geometric solutions which are expressed as Riemann theta function can be obtained through the two functions mentioned above.

Application of the trigonal curve to a hierarchy of generalized Toda lattices

“…Для (2 × 2)-матричных спектральных задач уже были получены алгебро-геометрические решения соответствующих солитонных уравнений, выражающиеся через тета-функции Римана на гиперэллиптической кривой [19]- [21]. Однако исследования алгебро-геометрических решений солитонных уравнений третьего порядка очень немногочисленны.…”