do you have an example of usage

Yes, I am trying to create the command \operatorname in ConTeXt. I know that in LaTeX \operatorname{xyz} is equivalent to \mathop{\newmcodes@\kern\z@\operator@font xyz}\csname nolimits@\endcsname} according to the AMSopn package ( http://www.bakoma-tex.com/doc/latex/amsmath/amsopn.pdf), and I am trying to translates that in ConTeXt: \mathop{\newmcodes@\kern\zeropoint\mfunction{xyz}}\nolimits but \newmcodes@ produces an error. In LaTeX, \newmcodes@ is defined as \begingroup \catcode`\"=12 \gdef\newmcodes@{\mathcode`\'39\mathcode`\*42\mathcode`\."613A% \ifnum\mathcode`\-=45 \else \mathchardef\std@minus\mathcode`\-\relax \fi \mathcode`\-45\mathcode`\/47\mathcode`\:"603A\relax} \endgroup according to the AMSopn package, so I have copied the code in my document (I only removed the @ so that I don't have to convert its catcode) but the if condition gives an error (however it compiles fine without the if condition). I also know that there is the ConTeXt command \definemathcommand[nolop]{xyz} which I thought stands as an equivalent to the \operatorname wrapper \DeclareMathOperator, but apparently not since it doe not use the 3 commands 1. \newmcodes@ 2. \kern\z@ 3. \operator@font in it, so I wonder the point of such a wrapper since all it seems it does is translates to \mathop{xyz}\nolimits To sum up, I would like to have a \DeclareMathOperator in ConTeXt, so here are my 2 questions: 1. What is the ConTeXt equivalent of \newmcodes@? 2. What is the point of \definemathcommand? Maggyero