Definition:Wave Equation

Equation
The equation of wave motion is a second order PDE of the form:


 * $\nabla^2 \phi = \paren {\dfrac {\partial^2 \phi} {\partial x^2} + \dfrac {\partial^2 \phi} {\partial y^2} + \dfrac {\partial^2 \phi} {\partial z^2} } = \dfrac 1 {c^2} \dfrac {\partial^2 \phi} {\partial t^2}$

Also see

 * Solution to Equation of Wave Motion