A zero function is a function that is almost everywhere zero.
The function sometimes known as "the zero function" is the constant function with constant 
, i.e., 
(Kimberling 1998, p. 53).
Zero Function
See also
Constant Function, Identity FunctionExplore with Wolfram|Alpha
References
Kimberling, C. "Triangle Centers and Central Triangles." Congr. Numer. 129, 1-295, 1998.Referenced on Wolfram|Alpha
Zero FunctionCite this as:
Weisstein, Eric W. "Zero Function." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ZeroFunction.html