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

Gavin gavinpublic at comcast.net
Thu Jan 13 13:19:27 CET 2022

Thanks, Hans! Appending to \everymathematics is a powerful trick, which I will not overuse.

-Gavin

> On Jan 12, 2022, at 12:14 PM, Hans Hagen <j.hagen at xs4all.nl> wrote:
>
> 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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>
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