# Thread: AIP conference proceeding using aip-cp.cls. Problem with "Definition", "Theorem" etc.

1. ## AIP conference proceeding using aip-cp.cls. Problem with "Definition", "Theorem" etc.

Attached file is the sample in TEX file, provided by AIP for conference proceeding: sample.tex

I have error when I tried to run \begin{definition} *** \end{definition} \begin{theorem} *** \end{theorem}
etc. What can I do?

2. ## Re: AIP conference proceeding using aip-cp.cls. Problem with "Definition", "Theorem"

I manage to do this

And this is the output

How to make the numbering be Theorem 2.1, Theorem 2.2 (as this is section 2) instead of Theorem 0.1, Theorem 0.2.