Abstract
In this paper, by using the direct method of calculating periodic wave solutions proposed by Akira Nakamura, we present a numerical process to calculate the 3-periodic wave solutions to several KdV-type equations: the Korteweg–de Vries equation, the Sawada–Koterra equation, the Boussinesq equation, the Ito equation, the Hietarinta equation and the (2+1)-dimensional Kadomtsev–Petviashvili equation. Some detailed numerical examples are given to show the existence of the three-periodic wave solutions numerically.
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