On the monotonicity of limit wave speed to a perturbed gKdV equation

This paper deals with the monotonicity of limit wave speed c0（h） to a perturbed g KdV equation. We show the decrease of c0（h） by combining the analytic method and the numerical technique. Our results solve a special case of the open question presented by Yan et al., and the method potentially provides a way to study the monotonicity of c0（h） for general m ∈ N+.