Abstract
We point out that the two-soliton (antisoliton) solutions of the sine-Gordon equation may be obtained as limiting cases of a separable, two-parameter family of elliptic solutions. The solitons are found on the boundary of the parameter space for the elliptic solutions when the latter are considered over their usual complex domain.
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Bryan, A.C., Haines, C.R. & Stuart, A.E.G. Solitions and separable elliptic solutions of the sine-Gordon equation. Lett Math Phys 3, 265–269 (1979). https://doi.org/10.1007/BF01821845
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DOI: https://doi.org/10.1007/BF01821845