The Sawada-Kotera equation with a nonvanishing boundary condition, which models the evolution of steeper waves of shorter\nwavelength than those depicted by the Korteweg de Vries equation, is analyzed and also the perturbed Korteweg de Vries (pKdV)\nequation. For this goal, a capable method known as the multiple exp-function scheme (MEFS) is formally utilized to derive the\nmultiple soliton solutions of the models.The MEFS as a generalization of Hirotaâ??s perturbation method actually suggests a systematic\ntechnique to handle nonlinear evolution equations (NLEEs).
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