In ConTeXt, I want to lift a
\hat slightly up, since
\hat is too low and touches the variable.
Now, this post is exactly what I want.
However, ConTeXt seemingly doesn't recognize
I don't understand the nature of
\rule, and I can't find explanation in The TEXbook nor in TEX for the Impatient.
\rule a LaTeX function?
Where can I find the function definition, and how can I implement it using (perhaps) plain TEX and ConTeXt functions?
Or are there other ways to achieve the result?