Den 18 aug. 2016 9:09 em skrev "Aditya Mahajan" <adityam@umich.edu>:
>
> On Wed, 17 Aug 2016, Mikael P. Sundqvist wrote:
>
>> Hi!
>>
>> look at the output of this (attached)
>>
>> \definemathcommand [D] [nolop] {\mfunction{D}}
>> \starttext
>> Compare $\D f$ with $\mfunction{D}f$.
>> \stoptext
>>
>> In the \D, the D is lowered a bit. I think it should not be, or else I
>> misuse something. If so, how should I define my own operator (I found
>> this example on the wiki).
>
>
> This is a "feature" of \mathop.
>
>
> \definemathcommand [D] [nolop] {\mfunction{D}}
> \starttext
> Compare $\D f$ with $\mfunction{D}f$ and $\mathop{\mfunction{D}}f$.
> \stoptext
>
> If the argument of \mathop is a single character, \mathop centers the
glyph on the math axis (This is useful for \sum, \int, \prod, etc.). To
circumvent this, use:
>
> \definemathcommand [D] [nolop] {\mfunction{D}\kern\zeropoint}
>
> Aditya
>
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___________________________________________________________________________________

Thank you very much for the clear explanation and neat work-around, Aditya.

/Mikael