Practice problem
Which conformal mapping identifies the upper half plane H\mathbb{H}H with the unit disk D\mathbb{D}D?
z↦z−iz+iz \mapsto \frac{z-i}{z+i}z↦z+iz−i
z↦i1+z1−zz \mapsto i\frac{1+z}{1-z}z↦i1−z1+z
z↦eizz \mapsto e^{iz}z↦eiz
Type a concept, like “slope” or “photosynthesis”.