let g, f1, f2 be complex-valued Function; :: thesis: g / (f1 / f2) = (g (#) (f2 | (dom (f2 ^)))) / f1
thus g / (f1 / f2) = g (#) ((f1 / f2) ^) by Th47
.= g (#) ((f2 | (dom (f2 ^))) / f1) by Th51
.= (g (#) (f2 | (dom (f2 ^)))) / f1 by Th52 ; :: thesis: verum