Hi Henri and Alan,
Thank you for your answers.
Fabrice

Le mer. 26 sept. 2018 à 23:52, Alan Braslau <braslau.l...@comcast.net> a
écrit :

> On Thu, 27 Sep 2018 09:22:00 +1200
> Henri Menke <henrime...@gmail.com> wrote:
>
> > On 27/09/18 09:15, Fabrice Couvreur wrote:
> > > Hello,
> > > How to improve the notation of an arc ?
> > > Thank you
> > > Fabrice
> > >
> >
> > Use the correct math fence
> >
> > \starttext
> > \m{\overparent{\rm AB}}
> > \stoptext
> >
> > > \starttext
> > >  \m{\overset{\frown}{\rm AB}}
> > > \stoptext
>
> And, if you prefer, you can use MetaPost (rather than the font extensible):
>
> \useMPlibrary[mat]
>
> \definemathstackers
>   [mp]
>   [alternative=mp]
>
> \definemathextensible [mp] [overparent] ["FE3DC]
>
>
> Alan
>
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