What is the correct way of having all operator names be set in, say, sans serif? Saying

An $\operator 1$.

seems to do the trick, but amsopn.sty defines


which seems to do more...

It would be nice if there were a @-free way of doing this, by the way.

  • 1
    You need to redefine \operator@font, which is used in other macros with that name. Either use \makeatletter and \makeatother or rewrite amsopn.sty in order not to use \operator@font. I guess that the choice is easy. :)
    – egreg
    Feb 2, 2012 at 0:02

2 Answers 2


You can define a new symbol font, and also redefine \mathsf to use it, otherwise you'd waste a math group and there are only 16 of them:


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    Is there any way to get this to work with unicode-math?
    – arynhard
    Feb 17, 2015 at 22:54
  • 1
    @arynhard This warrants a new question
    – egreg
    Feb 17, 2015 at 23:11

You ask in a comment how to get this to work in unicode-math and were asked to post a new question. For the sake of anyone searching for the answer (or flagging a duplicate question):

To set the operatorfont to something other than \mathrm, use, for example:


This also works with math font faces you define with \setmathfontface, not only the built-in math alphabets.

To change the \mathrm font, use \setmathrm. If you’ll be using it in \boldmath, you might also want to \setboldmathrm.

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