# [texhax] LaTeX

pjotr at ualg.pt pjotr at ualg.pt
Tue Sep 18 14:43:33 CEST 2007

Dear Paul, or whoever reads this

I don't know if this e-mail'll arrive (the page I found it was 3 years
old), but if it does, I want to say that your comment was very
helpful. It was EXACTLY what I needed for exactly the purpose you
describe.

Thanks.

- Peter

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message taken from
http://tug.org/mail-archives/texhax/2004-September/002771.html

Hi TeXnicians,

I often need to type subscripts in math mode that are roman instead of
italic. To avoid having to do a \mathrm every time, I defined

\catcode\_=\active
\def_{\sb\mathrm}

so I can have roman subscripts with $X_{ff}$ and italic subscripts with
$X\sb{ff}$.

My question is: Since I have some experience in using TeX, but very little
experience in programming TeX, are there any disadvantages to this method?

Thanks,

Paul

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