From: [email protected] [mailto:[email protected]] On Behalf Of 
Paul A. Rubin
Sent: fredag 24. februar 2017 16.28
To: [email protected]
Subject: Re: new operators in LyX?

On 02/24/2017 10:07 AM, Bernt Lie wrote:

I use LyX 2.2 on Win10.



I need to typeset the signum function as an operator. I have tried to insert 
"\mathop{sgn}", but this gives "sgn" in italic, and not in roman as it should.



Is there a syntax for this?



-Bernt
Assuming that you are loading AMSMath, try adding 
\DeclareMathOperator{\sgn}{sgn} to the document preamble and then use \sgn in 
math insets.

Paul
--
I’m pretty sure that I managed to do it without changing the preamble a few 
days ago, but I cannot remember what command I used...

-Bernt

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