On 08/09/2013 03:52 AM, Jens-D. Doll wrote:
now I found it. The problem was, that I could not identify the symbol
sets. After enabling one set it appears somewhere at the bottom, where
several others already are shown....
Just another question: How do I activate the \sqint symbol? The
processor says: undefined symbol.
In general, get yourself a copy of the comprehensive list of LaTeX symbols:
Look up sqint, and see what packate it requires. Include said package.
In this case, though, you can just go to Document> Settings> Math
Options, and check "Include esint package automatically". That's the
right package, and then LyX will take care of it.