# Functions

This notebook will introduce the concept of **functions** in terms of the Python programming language. I will endevour to use examples of *chemistry* related problems, but occasionally examples from physics or mathematics will come through.

Like many other programming languages Python lets you utilise functions -- is to have you have to write less code.

The concept of a function should be familiar from mathematics, e.g.

$f(x)$

where, $f(x)$ is some mathematical operation that acts on the argument, $x$. An example of a function is,

$f(x) = x^2.$

Using this we can say that $f(2) = 4$, $f(3) = 9$, etc.

The use of functions is an important paradigm in programming -- the following Jupyter notebook gives a quick introduction to functions  and how they can be used.