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.