# Wave Equation

1. Mar 29, 2010

### coki2000

Hi,
Why the wave equation is
$$\frac{\partial^2 u}{\partial^2 x}=c^2\nabla^2 u$$?
Where does it come from?Thanks.

2. Mar 29, 2010

### Integral

Staff Emeritus
For me to consider your relationship the wave equation I would have to change it to:

$$\frac{\partial^2 u}{\partial^2 t}=c^2\nabla^2 u$$

The wave equation is probabley derived in every intro to PDE text book.

https://www.amazon.com/Partial-Diff...sr_1_1?ie=UTF8&s=books&qid=1269898492&sr=8-1"

Last edited by a moderator: Apr 24, 2017