I hoped for some more explanation >>why< it behaves in this way.
Just the programmer's curiosity.
But thanks a lot, Elijah, the solution works!

On 28 zář, 13:50, Elijah Gregory <[email protected]> wrote:
> This seems more like a hack than anything, but sending a string
> containing _- (underscore minus) with the chl parameter appears to
> render a minus all by it's lonesome.
>
> http://chart.apis.google.com/chart?cht=tx&chl=_-
>
> Which is strange, since you get a bad syntax error if you try
> rendering the underscore by itself, or in front of a plus sign.
>
> On Mon, Sep 27, 2010 at 12:18 PM, Martin Šedý <[email protected]> wrote:
> > Hello,
>
> > I just wanted to ask if there is any way to render a formula
> > containing a minus sign. Just a minus sign, nothing else. I searched
> > the FAQ and forum, but the closest thing I found was a plus minus
> > sign.
>
> > This works not:
> >http://chart.apis.google.com/chart?cht=tx&chl=+
>
> > Neither this:
> >http://chart.apis.google.com/chart?cht=tx&chl=-
>
> > This works well:
> >http://chart.apis.google.com/chart?cht=tx&chl=%2B
>
> > I see, there is replacement text for a plus sign. What is the right
> > replacement text for minus sign? I searched the FAQ, forum and even
> > web (for TeX-related sources) and found none. Does anyone know?
>
> > Thanks,
> > Martin [256218]
>
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