and choose 
and
so that the wx and w terms drop out in the P.D.E.
for w. This requires:
Put and choose and
so that the wx and w terms drop out in the P.D.E.
for w. This requires:
Then:
No fun! Note that the generalized Fourier series coefficients for u become normal Fourier coefficients for w.
11/17/00 0:46:53