Given functions 
and 
, their composition function is the function
 |
defined by 
.
The order matters in general: 
first applies 
and then applies 
.
Composition Function
See also
Function Composition, FunctionExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Composition Function." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/CompositionFunction.html