http://www.math.harvard.edu/~siu/math113/solution_homework_feb5a.pdf
Can someone explain me the solutions to the questions on page 1.
I am not sure how $|w-z| / |1-w \bar z|<1$ becomes $|w-z|^2 < |1-w\bar z|^2 $
and later how the equation once you expand it has wz(bar)