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`displaymath`

Synopsis:

\begin{displaymath}mathematical text\end{displaymath}

Environment to typeset the math text on its own line, in display style
and centered. To make the text be flush-left use the global option
`fleqn`

; see Document class options.

In the `displaymath`

environment no equation number is added to the
math text. One way to get an equation number is to use the
`equation`

environment (see equation).

LaTeX will not break the `math text` across lines.

Note that the `amsmath` package has significantly more extensive
displayed equation facilities. For example, there are a number of
ways in that package for having math text broken across lines.

The construct `\[`

is essentially a synonym for
`math text`\]`\begin{displaymath}`

but the
latter is easier to work with in the source file; for instance,
searching for a square bracket may get false positives but the word
`math text`\end{displaymath}`displaymath`

will likely be unique. (The construct
`$$`

from Plain TeX is sometimes
mistakenly used as a synonym for `math text`$$`displaymath`

. It is not a
synonym, because the `displaymath`

environment checks that it isn’t
started in math mode and that it ends in math mode begun by the matching
environment start, because the `displaymath`

environment has
different vertical spacing, and because the `displaymath`

environment honors the `fleqn`

option.)

The output from this example is centered and alone on its line.

\begin{displaymath} \int_1^2 x^2\,dx=7/3 \end{displaymath}

Also, the integral sign is larger than the inline version
`\( \int_1^2 x^2\,dx=7/3 \)`

produces.