(LaTeX2e)
\ensuremath{Text set in math mode}
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 argument of
the \ensuremath
command.
Thus \ensuremath{$\alpha^2+\beta^2$}
is not
correct.
The correct form is \ensuremath{\alpha^2+\beta^2}
.
\newcommand