On 9/21/2023 11:21 AM, Aditya Mahajan wrote:
On Thu, 21 Sep 2023, Xavier B. wrote:

Hi,

I want to write:

$0,00\stackrel{\smallfrown}{4}$

like latex 
[https://tex.stackexchange.com/questions/39225/differences-between-stackrel-and-stackbin]

but context LMTX does not recognize stackrel

What can I do?

\stackrel is defined in context (with almost the same definition as latex). You 
get an error because \smallfrown is not defined.
a teaser for Aditya:

\definemathstackers[toprel][top][mathclass=\mathrelationcode]
\definemathstackers[topbin][top][mathclass=\mathbinarycode]

\definemathextensible[toprel][frownedupon]["2322]
\definemathextensible[topbin][frowned]    ["2322]

\starttext
    $x \frownedupon{4} y + \frowned{!} z = 10$
\stoptext


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