Semifoldons with fusion and fission properties of (2 + 1)-dimensional nonlinear system

In this paper, by virtue of q-deformed hyperbolic functions, the variable separation solution with two variable separated functions of the (2 + 1)-dimensional Broer–Kaup–Kupershmidt equation (BKKE) is obtained. Based on this variable separation solution, soliton fusion and fission phenomena among semifoldons are investigated.