Enlarged spectral problems and nonintegrability
arXiv:nlin/0504037 · doi:10.1016/j.physleta.2005.06.114
Abstract
The method of obtaining new integrable coupled equations through enlarging spectral problems of known integrable equations, which was recently proposed by W.-X. Ma, can produce nonintegrable systems as well. This phenomenon is demonstrated and explained by the example of the enlarged spectral problem of the Korteweg - de Vries equation.
11 pages