The argument of the `\ensuremath` command is always set in
math mode, regardless of the current mode. Note that math mode
is **not** specifically invoked in the `Text set
in math mode`.

Thus `\ensuremath{$\alpha^2+\beta^2$}` is **not
correct**.

The **correct** form is `\ensuremath{\alpha^2+\beta^2}`.

See also `\newcommand`

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Revised by Sheldon Green, agxsg@giss.nasa.gov, 4 May 1995.