### Hypertext Help with LaTeX

## Subscripts

To get an expression, `exp`, to appear as a
subscript, you just type `_{exp}`.

Can be used
only in math mode. Thus, for a
simple expression that is part of the running text:

`H$_2$O is the formula for water`

should display as "H_{2}O is the formula for water".
Note that the braces around the argument may be omitted if the
subscript is a single character.

If a symbol has both subscripts and superscripts, the order
doesn't matter. The following are equivalent:

a_n^2

and

a^2_n

Subscripts are normally displayed in a smaller font; to
prevent this and, for example, use a standard Roman font, one
would use;

$J_{\rm Roman}$

See also: Math Formulas,
Superscripts

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Revised 31 May 1995.