###### 1-D Wave Index of PDE's ######
All animations presented in this section represent finite-difference solutions to some variation
of the standard the 1+1 wave equation
Utt=a**2*Uxx
On some domain or other.
The specific PDE's solved for each video are listed below.
1 ##### 1d Wave, gaussian #####
Utt=Uxx
U(x,0)=exp(-(x-5)**2)
Ut(x,0)=0
U(Boundary)=0
Domain={x | 0