# [NTG-context] \sub conflict with my def

Hans Hagen j.hagen at xs4all.nl
Wed Jan 12 20:14:49 CET 2022

On 1/12/2022 7:34 PM, Gavin via ntg-context wrote:
> Hi List,
>
> I am converting problem sets from LaTeX to ConTeXt and ran into a puzzling problem. I define \sub to produce subscript text in math mode. (See definition below.) This worked for my ConTeXt book, but fails in the problem sets because in ConTeXt \sub is a special item command, and I use itemize to number problems.
>
> Obviously, I can rename my \sub command, but it is already used in hundreds of problems and solutions that I am converting. Is there a way to get my \sub to work in an itemize? I only need it in math mode. I will never use \sub for its ConTeXt itemizing purpose.

\appendtoks
\define[1]\sub{_{\text{\rm\tf#1}}}%
\to \everymathematics

or nicer:

\define[1]\MyMathSub{_{\text{\rm\tf#1}}}

\appendtoks
\let\sub\MyMathSub
\to \everymathematics

> Thanks!
> Gavin
>
>
> \define[1]\sub{_{\text{\rm\tf#1}}}
>
> \starttext
>
> $E\sub{final}$ is the final energy, but not in an itemize:
>
> \startitemize
> \item $E_{\text{\rm final}}$ is the final energy.
> \item $E\sub{final}$ is a mess.
> \stopitemize
>
> \stoptext
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