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.
The amsmath package defines an equation* environment
which is functionally identical to displaymath but allows use
of other amsmath facilities. In general,
amsmathhas significantly more extensive displayed equation
facilities. For example, there are a number of ways in that package
for having math text broken across lines; see also the breqn
package for that (https://ctan.org/pkg/breqn).
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 instead of LaTeX’s displaymath. Although the output is
similar, but is not officially supported in LaTeX at all; $$
doesn’t support the fleqn option, 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.