Fig. 1

Kink wave solution of \( u_{1} \) when \( a_{2} = 1, {\kern 1pt} {\kern 1pt} {\kern 1pt} a_{0} = 2,{\kern 1pt} {\kern 1pt} {\kern 1pt} y = 0, {\kern 1pt} {\kern 1pt} {\kern 1pt} \lambda = 3,{\kern 1pt} {\kern 1pt} {\kern 1pt} \mu = 2, {\kern 1pt} {\kern 1pt} {\kern 1pt} c_{1} = 1 \)