Open Map
See also
Open Mapping Theorem, Open SetExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Open Map." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/OpenMap.html
Weisstein, Eric W. "Open Map." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/OpenMap.html