This can be used to stack something above something else; used in math mode.

\stackrel{top}{bot}

The first argument, `top`, is typset immediately above
the second argument, `bot`; the former is set in the same
math style as a superscript.

For example

H$_2$CO$_3$ $\stackrel{\rm heat} {\longrightarrow}$ H$_2$O + CO$_2$

will produce something like

heat H CO ------> H O + CO 2 3 2 2

Note that the the `\rm`
declaration is used so that "heat" is set in Roman face and not
math italics.

This command does not seem to be well documented but appears to work, at least in current versions of LaTeX 2.09.

The argument is considered to be a single variable sized math symbol for purposes of placing limits below (subscripts) and above (superscripts) in display math style. For example,

\mathop{\sum \sum}_{i,j=1}^{N} a_i a_j

would produce something like

N --- --- \ \ / / a a --- --- i j i,j

It is possible to create **two rows** of
"subscripts" by using a similar construction: The first row is
created as subscripts of the symbol in the usual way and a lower
row is created by placing this whole construct as the argument
of a `\mathop` command with its own subscript. For example

\mathop{\sum_{i,j=1}^{N}}_{i>j}

would produce something like

N --- \ / --- i,j=1 i>j

Related topics

- Math Formulas and Math Symbols
- Arrows
- Binary and relational opertors
- Eqnarray Environment
- Equation Environment
- Displaymath Environment
- Math Fonts and Styles

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Revised 15 Aug 1995.