1987 年 56 巻 10 号 p. 3480-3490
A sine-lattice equation sin (un+1−un)−sin (un−un−1)−\ddotun=0 is shown both analytically and numerically to exhibit approximate, but well-defined, one- and multi-kink solutions of the form un=A tan−1(αn⁄βn) for an arbitrary constant A>0, where the quantities αn and βn are simply discrete versions of the corresponding ones in the conventional sine-Gordon equation. This is due to the kink dispersion relation 4 sinh2(k⁄2)−ω2=0 entirely equal to the case of the Toda lattice solitons.
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