"An easier way to approach to problem is to describe the emission of the photon in the initial rest frame of the electron. You can then make an argument based on the principle of relativity."
Hmm... the electron will see the photon as moving away with c. I don't follow you.
Hello,
1. Show that a free electron in a vacuum at velocity v cannot emit a single photon.
My ideas:
Momentum is conserved. Energy is conserved.
Hence (E(before)=E(after)): gamma(before)*m(e)*c^2 = E(photon) + gamma(after)*m(e)*c^2
where E(photon)=hc/lamda
(P(before)=P(after))...