# 
# Numerical Mathematics and Computing, Fifth Edition
# Ward Cheney & David Kincaid
# Brooks/Cole Publ. Co.
# (c) 2004
#
# file:  wave
#
# Hyperboic PDE: wave equation
#
with(linalg):
with(PDEtools):
pde := diff(u(x,t),x,x) - diff(u(x,t),t,t) = 0;
ans := pdsolve(pde);
pdetest(ans,pde);