A G-space provides local notions of harmonic, hyperharmonic, and superharmonic functions. When there exists a nonconstant superharmonic function
greater than 0, it is a called a Green space. Examples are 
(for 
) and any bounded domain of 
.
Green Space
See also
G-SpaceExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Green Space." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/GreenSpace.html