# Using the d'Alembert operator for wave equations

1. Dec 21, 2008

1. Is there anywhere where I can find a derivation for the generalized inhomogeneous wave equation? I found a derivation of the 1D wave equation for an infinitesimal region of an elastic string here:

http://www.math.ubc.ca/~feldman/apps/wave.pdf

But I am looking for proof of the generalized version in n dimensions where