displaymath (environment)

From LaTeX-wiki

\begin{displaymath}
...
\end{displaymath}

Non-numbered environment for displayed formulae. Equivalent to equation* (environment).

[edit] Shorthand notation

As this may be the most often used environment, the following shorthand is commonly used:

\[
...
\]

There is also a second shorthand, $$, the use of which is discouraged.