The unit upper half-disk is the portion of the complex plane satisfying .
Upper Half-Disk
See also
Disk, Lower Half-Disk, Real Axis, Semicircle, Unit Disk, Upper Half-PlaneExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Upper Half-Disk." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/UpperHalf-Disk.html