# Hypertext Help with LaTeXDisplaymath

There are four environments that put LaTeX in math mode: math, displaymath, eqnarray, and equation. The math environment is for formulas that appear right in the text. The displaymath and equation environments are for formulas that appear on their own line; they differ only insofar as the latter prints an equation number. LaTeX will not break lines in displaymath or equation environments, but can be told to do so with a \\ command in both the math environment and within an eqnarray.

The displaymath environment can be entered by

  \begin{displaymath}
math equation
\end{displaymath}

Because displaymath may be used frequently to display relatively short equations, there are convenient alternative forms:
  $displayed math equation$

and (still working, but deprecated in LaTeX2ε):
  $$displayed math equation$$