I just tested both solutions and that of Alan does not work as expected.
\useMPlibrary[mat]
\definemathstackers
[mp]
[alternative=mp]
\definemathextensible [mp] [overparent] ["FE3DC]
\starttext
\m{\overparent{ AB}}
\stoptext
Le jeu. 27 sept. 2018 à 21:47, Fabrice Couvreur <fabrice1.couvr...@gmail.com>
a écrit :
> 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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>
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