In: Advanced Math
We are working on functions of complex variables in calculus (Chpt. 17.4 in Advanced Engineering Mathematics), and our prof posed us the following question:
"Find the function w = u + iv = f(z) that maps the region S := {z : 0 ≤ arg z ≤ π 4 } to the upper half plane {w = u + iv : v ≥ 0}."
the answer he gave to this problem was as follows: "such a mapping is given by f(z) = z^4 = r^4*e^4iθ where z = re^iθ ."
I am unsure how he came to this conclusion, could someone please help? Thanks!