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Help On LaTeX \stackrel and \mathop
Hypertext Help with LaTeX \stackrel
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.
Hypertext Help with LaTeX a name="mathop">\mathop
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
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Revised: Sheldon Green, 15 Aug 1995.