`\lefteqn{eqn}`

Prints `eqn` in display math style, but pretends that
it has zero width. It is typicaly used within an
`Eqnarray` environment for
displaying long equations that require multiple lines.

A typical use might be

\begin{eqnarray} \lefteqn{\int_0^\infty some expression =} \\ & & some terms \\ & & \mbox{} + more terms \end{eqnarray}

Note that the empty
`\mbox{}` is so LaTeX knows
that the following `+` is a binary operator, and is not
attached to the first of the "more terms" as a unary operator.

Related topics

- Environments
- Array Environment
- Eqnarray Environment
- Equation Environment
- Displaymath Environment
- Math Formulas

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Revised 29 Jun 1995.