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
Hi Henri and Alan, Thank you for your answers. Fabrice
Le mer. 26 sept. 2018 à 23:52, Alan Braslau
a écrit : On Thu, 27 Sep 2018 09:22:00 +1200 Henri Menke
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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