# [NTG-context] Math literal colon

Hans Aberg haberg-1 at telia.com
Mon Jul 20 18:22:52 CEST 2015

```> On 20 Jul 2015, at 17:43, Manuel Blanco <manuelbl at ucm.es> wrote:
>
> Well, you can make the colon active in math mode and then let it output \colon.
>
> This is a TeX way, I don't know if there's a ConTeXt way for this:
>
>    \begingroup\lccode`\~=`\:\lowercase{\endgroup
>      \let~}\colon
>    \mathcode`\:="8000 %

For some reason, the colon in ConTeXt is larger relative LuaTeX.

Also, it seems that “\:” is not used for anything - error in luatex, and empty in context. So it might be used for the infix operator.

— context —
\setupbodyfont[xits,10pt]

\setupformulas[location=left]

\begingroup\lccode`\~=`\:\lowercase{\endgroup
\let~}\colon
\mathcode`\:="8000 %

\starttext

The function \$f: A → B\$, \$g\colon A → B\$.

\stoptext
—

— luatex —
\begingroup\lccode`\~=`\:\lowercase{\endgroup
\let~}\colon
\mathcode`\:="8000 %

The function \$f: A → B\$.
—

```