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8.8 eqnarray

     \begin{eqnarray}  (or eqnarray*)
     formula1 \\
     formula2 \\
     ...
     \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 &.

\\* can also be used to separate equations, with its normal meaning of not allowing a page break at that line.

An equation number is placed on every line unless that line has a \nonumber command. Alternatively, The *-form of the environment (\begin{eqnarray*} ... \end{eqnarray*}) will omit equation numbering entirely, while otherwise being the same as eqnarray.

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.