Summary
It is shown that all soliton systems corresponding to the reductionr=−q of the ZS-AKNS spectral problem with an analytic at ϕ=0 dispersion relation express a trivial geometric fact: the Gaussian curvature of a plane is zero.
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Sym, A. Soliton surfaces. Lett. Nuovo Cimento 39, 193–196 (1984). https://doi.org/10.1007/BF02783669
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DOI: https://doi.org/10.1007/BF02783669