I brought back the u' parts where I think you had changed them. Seems like it will be OK and this way the Leibniz subsection can stay intact. There are no incidents of things like (2x+1)', just u'. And If it's OK to write y' in places, I'd guess it should be OK to write u'.
I brought back the u' parts where I think you had changed them. Seems like it will be OK and this way the Leibniz subsection can stay intact. There are no incidents of things like (2x+1)', just u'. And If it's OK to write y' in places, I'd guess it should be OK to write u'.