GNU Info

(latex.info)eqnarray

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eqnarray
--------

      \begin{eqnarray}
      math formula 1 \\
      math formula 2 \\
      .
      .
      .
      \end{eqnarray}

   The `eqnarray' environment is used to display a sequence of
equations or inequalities.  It is very much like a three-column `array'
environment, with consecutive rows separated by `\\' and consecutive
items within a row separated by an `&'.

   An equation number is placed on every line unless that line has a
`\nonumber' command.

   The command `\lefteqn' is used for splitting long formulas across
lines. It typesets its argument in display style flush left in a box of
zero width.