Bretherton equation

In mathematics, the Bretherton equation is a nonlinear partial differential equation introduced by Francis Bretherton in 1964:

with ${\displaystyle p}$ integer and ${\displaystyle p\geq 2.}$ While ${\displaystyle u_{t},u_{x}}$ and ${\displaystyle u_{xx}}$ denote partial derivatives of the scalar field ${\displaystyle u(x,t).}$

...
Wikipedia