# [GiNaC-devel] Positive add and mul, LaTeX printing

Alexei Sheplyakov varg at metalica.kh.ua
Tue Sep 15 19:33:36 CEST 2009

Hi,

On Tue, Sep 15, 2009 at 02:22:45PM +0100, Vladimir V. Kisil wrote:
> 		I think it would be nice if GiNaC will learn that a sum or product of
>   two positive expressions is again a positive expression.

Sounds sensible.

> This will help, for example, to simply formulae like ((1+x)^{1/2})^2, where x
> is a positive symbol.

I hope no simplifications of this kind will be done automatically.

>   It would be also a better LaTeX printing of complicated formulae if \mathrm
>   will be used instead of \mbox (the later is not scaled in fractions, for
>   example).

I agree.

>   I am attaching a patch which makes these two things.

\begin{tip}

Your patch does two absolutely unrelated things. It's better to spilt such
patches into independent parts (this makes merging and identifying bugs
a bit simpler).

\end{tip}

Best regards,
Alexei