> On 20 Jul 2015, at 17:50, Manuel Blanco <manue...@ucm.es> wrote:
> 
> A little bit more of intelligence can be given with
> 
>    \begingroup\lccode`\~=`\:\lowercase{\endgroup
>      \unexpanded\def~}{\futurelet\tmptoken\docolon}
>    
> \unexpanded\def\docolon{\ifx=\tmptoken\mathrel{\mathop{\mathchar`\:}}\else\colon\fi}
>    \mathcode`\:="8000 %
> 
> That lets you do $f: A \to B$ and $f(x) := x^2$

For the second, one can use ≔ COLON EQUALS U+2254. But it is a good point, 
though.


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