An outline, also called a hierarchical outline, is a list arranged to show hierarchical relationships and is a type of tree structure.
An outline is used to present the main points or topics of a given subject.
Each item in an outline may be divided into additional sub-items.
What is a function?
In mathematics, a function from a set X to a set Y assigns to each element of X exactly one element of Y.
The set X is called the domain of the function and the set Y is called the codomain of the function.
Functions were originally the idealization of how a varying quantity depends on another quantity.
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