[texhax] Question about math fonts in LaTeX

[Uwe Lueck]

"Vafa Khalighi" <vafakhlgh at gmail.com>, 20.01.2011 14:41:15:
> Can you change the font of \mathbf so that the font of only digits 
> changes and everything else will be typeset in the default font.
> For  example, say your default font for \mathbf is cmr but you
> only want to  change the font of digits inside \mathbf to cmtt and
> nothing else so  that $\mathbf{xyz0123}$ give you xyz in cmr
> but 0123 in cmtt. Is  this doable? 
> (of course without creating a new font or modifying an existing font)


I think the coolstr package 

    http://ctan.org/pkg/coolstr

can tell "numeric strings" from others, so you could redefine 
\mathbf to analyze the characters and then apply font commands 
accordingly. 

HTH -- Uwe.