The portion of the complex plane 
with real part ![R[z]<0](/images/equations/LeftHalf-Plane/Inline2.svg)
.
Left Half-Plane
See also
Complex Plane, Lower Half-Plane, Right Half-Plane, Upper Half-PlaneExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Left Half-Plane." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/LeftHalf-Plane.html