Hi Hans,
the commands \xfrac and \xxfrac don’t work because the use the undefined
command \math_frac_alternative.
\unexpanded\def\xfrac
{\begingroup\let\xfrac\xxfrac\math_frac_alternative\scriptstyle}
\unexpanded\def\xxfrac{\begingroup \math_frac_alternative\scriptscriptstyle}
%% begin example
\starttext
\startformula
\frac{1}{2} \quad \xfrac{1}{2} \quad \xxfrac{1}{2}
\stopformula
\stoptext
%% end example
Wolfgang
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