Nonlinear Sciences – Exactly Solvable and Integrable Systems
Scientific paper
2006-09-27
Nonlinear Sciences
Exactly Solvable and Integrable Systems
LaTeX, 19 pages, 3 figures
Scientific paper
This is a survey article dedicated mostly to the theory of real regular "finite-gap" (algebro-geometrical) periodic and quasiperiodic Sine-Gordon solutions. Long period this theory remained unfinished and ineffective, and by that reason practically had no applications. Even for such simple physical quantity as "Topological Charge" no formulas existed expressing it through the "Inverse Spectral Data". Few years ago the present authors solved this problem and made this theory effective. This article contains description of the history and recent achievements. It describes also the reality problems for several other fundamental soliton systems.
Grinvich P. G.
Novikov Sergey P.
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