Hi;
I am trying to understand the rytov approximation... and when I was studying that, I could not understand a manipilation...
ΔeØ + k2eØ = 0
▼[▼ØeØ] + k2eØ = 0
▼2ØeØ + (▼Ø)2eØ+k2eØ = 0
I can not understand these manipilations... for a long time, I have searched the properties of...