Creating subscripts without italics

[Gerry Wolff]

If I put $CO_2$ into a Latex source file, it produces CO2 with the '2'
as a subscript, but it also puts the whole text into italics!

I would like CO2 to be written with '2' as a subscript, but without
the text being in italics.

Can anyone tell me how this can be done?

[Werner Grundlingh]

LaTeX automatically assumes that C & O in $CO_2$ are variables, and
require some spacing between them. You might notice a difference in
the spacing between, for example, $CO$ and \textit{CO} and/or {\it
CO}, just because the last two are in text mode, while the first is in
math mode. Regardless, if you want upright (or text mode) letters in
you math mode environment, use
#\mathrm{CO}_2$

Werner

[Vahid Damanafshan]

Use $\mathrm{CO}_2$.

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[jon]

On Sep 13, 3:58 pm, Gerry Wolff <gerrywolf...@googlemail.com> wrote:
> If I put $CO_2$ into a Latex source file, it produces CO2 with the '2'
> as a subscript, but it also puts the whole text into italics!
>
> I would like CO2 to be written with '2' as a subscript, but without
> the text being in italics.

memoir provides the commands:
\textsuperscript % which exists in, e.g., the article class
\textsubscript

which you can use outside math mode. if you want to emulate memoir's
textsubscript command, you could do:

\usepackage{relsize}
\newcommand{\subscript}[1]{\raisebox{-0.25em}{\smaller #1}}

cheers,
jon.