Fifth-order Korteweg–De Vries equation

A fifth-order Korteweg–De Vries (KdV) equation is a nonlinear partial differential equation in 1+1 dimensions related to the Korteweg–De Vries equation. Fifth order KdV equations may be used to model dispersive phenomena such as plasma waves when the third-order contributions are small. The term may refer to equations of the form

$u_t+\alpha u_{xxx}+\beta u_{xxxxx}=\frac{\partial }{\partial x}f(u,u_x,u_{xx})$

where $f$ is a smooth function and $\alpha$ and $\beta$ are real with $\beta \ne 0$. Unlike the KdV system, it is not integrable. It admits a great variety of soliton solutions.