Hi Wolfgang,
it's perfect !

thanks,

Fabrice

2016-07-14 6:41 GMT+02:00 Wolfgang Schuster <schuster.wolfgang@gmail.com>:

Fabrice Couvreur

13. Juli 2016 um 01:02

Hello,
I would like the text of the property is in italic without using the environment {\it}.

Use the enumeration environment.

Is this the best way when I use \setuptextrules[width=-1ex] ?

You can set the width and distance values to 0pt and put a space after the counter.

%%%% begin example
\setupbodyfont[pagella,11pt]

\define[1]\ProprieteHeadcommand
  {\textrule[top]{#1}}

\defineenumeration
  [propriete]
  [text=Propriété ,
   style=italic,
   headcommand=\ProprieteHeadcommand,
   numbercommand=\groupedcommand{}{\nbsp},
   after=\textrule]

\setuptextrules[width=0pt,distance=0pt]

\starttext

\startpropriete
    Soit \math{q} un réel \math{\neq 1}, alors pour tout entier naturel \math{n\geqslant 1} on a :
    \startformula
    S=1+q+q^2+\dots+q^n=\frac{1-q^{n+1}}{1-q}.
    \stopformula
\stoppropriete

\stoptext
%%%% end example

Wolfgang

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