I think I'm done. Forget everything or keep it in mind for the next stupid
one :-)


>$$x \mapsto \left\{
>     \begin{array}{ll}
>       1        & \text{ if } x > 0\\
>       \uparrow & \text{ elsewise}
>     \end{array}\right.
>$$
 ^^

Here's the solution. Using the old TeX stylish $$ for display formulae make
that formula blue, replaced it by \[ and \] makes everyhting green. I try
to change to the correct LaTeX stylish commands for years, but now i have a
reason to try it more seriously. On the other hand i'll keep that in mind
for making formulae blue :-)

Thanks a lot, your example led me the way.

hs


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