The portion of the complex plane satisfying , i.e.,
Lower Half-Plane
See also
Complex Plane, Half-Plane, Left Half-Plane, Lower Half-Disk, Right Half-Plane, Upper Half-PlaneExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Lower Half-Plane." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/LowerHalf-Plane.html