pR(Ui) already had an R(Ui), then you divided by it, but the original factor disappears so you are left with a divided by R(Ui). But I don’t see where the original factor of R(Ui) went, which would have resulted in cancelling.
You are correct, I dropped a R(Ui) in the proof, thanks! Put it back in, and the proof is now shorter.
pR(Ui) already had an R(Ui), then you divided by it, but the original factor disappears so you are left with a divided by R(Ui). But I don’t see where the original factor of R(Ui) went, which would have resulted in cancelling.
You are correct, I dropped a R(Ui) in the proof, thanks! Put it back in, and the proof is now shorter.