### 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: Sheldon Green, 31 May 1995.