Hello,
Thank you for your answers.
@Hans My ignorance is total : how to write symbols from the keyboard ?
Fabrice

Le sam. 29 août 2020 à 20:41, Hans Åberg <haberg-1@telia.com> a écrit :

> On 29 Aug 2020, at 19:58, Wolfgang Schuster <wolfgang.schuster.lists@gmail.com> wrote:
>
> Fabrice Couvreur schrieb am 29.08.2020 um 19:27:
>> Hello,
>> The result is not what you expected.
>> How can I correct this problem?
>
> 1. Wait for a fix.
>
> 2. Use \nsubset.
>
> \starttext
> \m{A \nsubset B}
> \stoptext

One can also use Unicode directly, choosing the style:

\starttext
\m{A ⊄ B ⊈ C ⊊ D}
\stoptext

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