Re: new operators in LyX?

[Paul A. Rubin]

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