Graphs make it clear how the function behave when they are applied to arguments e.g.
Graphs make it clear how the function behave when they are applied to arguments e.g.
- Apply(graph(which), (one, 2)) = num
Since a function can be represented by its graph, which is a set we will allow functions to accept other functions as arguments and produce functions as answers.
A function that uses functions as arguments or results is called a higher order function. Their graphs become complex rather quickly, but they do exist and are legal under the laws of set theory.