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The Lattice Sine-Gordon Equation as a Superposition Formula for an NLS-Type System
Dmitry K. Demskoi School of Computing, Mathematics and Engineering, Charles Sturt University,NSW 2678, Australia
Аннотация:
We treat the lattice sine-Gordon equation and two of its generalised symmetries as a compatible system. Elimination of shifts from the two symmetries of the lattice sine-Gordon equation yields an integrable NLS-type system. An auto-Bäcklund transformation and a superposition formula for the NLS-type system is obtained by elimination of shifts from the lattice sine-Gordon equation and its down-shifted version. We use the obtained formulae to calculate a superposition of two and three elementary solutions.
Ключевые слова:
quad-equation, NLS-type system, auto-Bäcklund transformation.
Поступила: 30 июня 2021 г.; в окончательном варианте 13 декабря 2021 г.; опубликована 21 декабря 2021 г.
Образец цитирования:
Dmitry K. Demskoi, “The Lattice Sine-Gordon Equation as a Superposition Formula for an NLS-Type System”, SIGMA, 17 (2021), 108, 10 pp.
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/sigma1790 https://www.mathnet.ru/rus/sigma/v17/p108
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