# 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 "H2O 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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