Re: Custom function names

[Siegfried MEUNIER-GUTTIN-CLUZEL]

In the new manual Math.lyx, there is a solution (section 15 Functions ) 
: As an example, if you want to define the sgn function, you put this 
lines in the LaTeX preamble :

\DeclareMathOperator{\sgn}{sgn}
Then you can use \sgn in your formulas.
Hope it helps.

Siegfried.