Abstract
A new type of KdV equation with a nonisospectral Lax pair as well as variable coefficients is introduced. Its Lax pair is shown to be invariant under the Crum transformation. This leads to a Bäcklund transformation for the KdV equation and, hence, a method for solutions via an associated nonisospectral variable coefficient MKdV equation. Three generations of solutions are given. The 1-soliton solution shares the novel phenomenology associated with the boomeron, trappon, and zoomeron of Calogero and Degasperis.
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Chan, W.L., Yu-Kun, Z. Solutons of a nonisospectral and variable coefficient Korteweg-de Vries equation. Lett Math Phys 14, 293–301 (1987). https://doi.org/10.1007/BF00402138
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DOI: https://doi.org/10.1007/BF00402138