On Thu, 27 Sep 2018 09:22:00 +1200
Henri Menke <henrimenke@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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