There are three environments that put LaTeX in math mode:

`math`

- For Formulae that appear right in the text.
`displaymath`

- For Formulae that appear on their own line.
`equation`

- The same as the displaymath environment except that it adds an equation number in the right margin.

The `math`

environment can be used in both paragraph and LR mode,
but the `displaymath`

and `equation`

environments can be used
only in paragraph mode. The `math`

and `displaymath`

environments are used so often that they have the following short forms:

\(...\) instead of \begin{math}...\end{math} \[...\] instead of \begin{displaymath}...\end{displaymath}

In fact, the `math`

environment is so common that it has an even
shorter form:

$ ... $ instead of \(...\)

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