'''Riemann mapping theorem''' states that if ''U'' is a simply connected, open, proper subset of the complex plane and x<sub>0</sub> is a point in ''U'', then there exist a unique function ''f'' mapping ''U'' into the interior of the [[unit disc]] such that ''f(x<sub>0</sub>) = 0'' and ''f'(x<sub>0</sub>) > 0''. | '''Riemann mapping theorem''' states that if ''U'' is a simply connected, open, proper subset of the complex plane and x<sub>0</sub> is a point in ''U'', then there exist a unique function ''f'' mapping ''U'' into the interior of the [[unit disc]] such that ''f(x<sub>0</sub>) = 0'' and ''f'(x<sub>0</sub>) > 0''. |