# Category:Functions

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This category contains results about Functions.

The process which is symbolised by an operation is called a **function**.

The operand(s) of the operation can be considered to be the input(s).

The output of the **function** is whatever the operation is defined as doing with the operand(s).

A **function** is in fact another name for a mapping, but while the latter term is used in the general context of set theory and abstract algebra, the term **function** is generally reserved for mappings between sets of numbers.