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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.


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