Science Forums 2

[sanctus]

Thanks very much, I figured it out after comparing the documents code with my code, you have to type before the \begin{document}:
\numberwithin{equation}{section}

and I guess if you replace section with subsection you get even the 1.1.2 for example.
You are right this document teaches a lot! Did i àunderstand right that you can make your own comands , for example if I want to shorten the \left( to \( I do it just do it by typing: \def\({\left(}