Not sure if this is the right group to be posting to.
Anyone familiar with the "Gravitation" book on g.r.? I'm working
through some of the excercises and have gotten stumped on excercise
2.1:

Show that the following relation is in accord with the quantum
mechanical properties of a de Broglie wave, psi(x,t) = e^(i phi) = e^(i
( k . x - omega t)):

p . v = ~p, v

where p is a momentum 4 vector, and ~p, v is the momentum one form
where the label on each surface is hbar x phase.

I'd appreciate any hints in the right direction or solutions.
Thanks,
Marco