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

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

should display as "xx$^3$ is the third power of x

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

a_n^2anda^2_n

Superscripts may have their own superscripts:

should display something like$x^{y^{z}}$

z y x

See also: Math Formulas, Subscripts

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Revised by Sheldon Green, agxsg@giss.nasa.gov, 31 May 1995.