displaymath ¶Synopsis:
\begin{displaymath}
mathematical text
\end{displaymath}
Environment to typeset the mathematical 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 \[ math \] is a synonym for the environment
\begin{displaymath} math \end{displaymath} but the
latter is easier to work with in the source; for instance,
searching for a square bracket may get false positives but the word
displaymath will likely be unique.
The construct $$math$$ from Plain TeX is
sometimes used as a synonym for LaTeX’s displaymath. It is
not a synonym, and is not officially supported in LaTeX at all;
$$ doesn’t support the fleqn option (see Document class options), has different vertical spacing, and doesn’t perform
consistency checks.
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.