I don't find Watchtel or Casualty Study Manual adequate. I'm missing
something, but not sure what.
M/P = L(y,r)
D(M/P) = Ly x Dr + Lr x Dy
This relationship is not clear. What does it mean?
The solution shows Ly = dL/dY and Lr = dL / dR and Ir = dI / dr. How does
it fit?
I realize it's late in the game. Any help is much appreciated.
Michael