CSL schrieb:

I want to have my equations numbered like (section.formula) so I put the
comand

\numberwithin{equation}{section}

in the preambule. I did in a document and it worked.
My problem is that now, I created a new document and it doesn't work.

You have to turn on "amsmath": Menu Document -> Settings -> Math Options -> "Use AMS 
math package"

It worked for you in the other document as LyX loaded the amsmath package automatically as you used amsmath stuff that is directly suppoerted by LyX. \numberwithin is not yet directly supported.

regards Uwe

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