The commend was meant for Hans, all *you* have to do is update your TeX installation, afterwards you can try the following example:15. Juni 2016 um 14:48Hi Wolfgang,Fabrice
what directory I put this file knowing that I installed the standalone version in /home/fab/context
\useMPlibrary[mat]
\setupmathstackers
[both]
[color=darkred,
alternative=mp]
\setupmathstackers
[top]
[color=darkred,
alternative=mp]
\setupmathstackers
[bottom]
[color=darkred,
alternative=mp]
\starttext
$\overbracket {a+b+c+d} \quad \underbracket {a+b+c+d} \quad \doublebracket{a+b+c+d}$ \blank
$\overparent {a+b+c+d} \quad \underparent {a+b+c+d} \quad \doubleparent {a+b+c+d}$ \blank
$\overbrace {a+b+c+d} \quad \underbrace {a+b+c+d} \quad \doublebrace {a+b+c+d}$ \blank
$\overbar {a+b+c+d} \quad \underbar {a+b+c+d} \quad \doublebar {a+b+c+d}$ \blank
$\overleftarrow {a+b+c+d} \quad \overrightarrow {a+b+c+d} $ \blank
$\underleftarrow {a+b+c+d} \quad \underrightarrow {a+b+c+d} $ \blank
\stoptext
Wolfgang
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