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I need to put \label in the theorem environment like this:

\documentclass{article}
\usepackage{amsthm}

\newtheorem{theorem}{Theorem}

\begin{document}
\begin{theorem}
This is Theorem.
\label{label}
\end{theorem}
\end{document}

I am writing to IJPRAI journal and I must use their style. When I ...

Thank you. I can use this to solve problem.

I try to put superscript in math mode after \max command, but I want to be in standard upper right position or upper left position, not above max. For example, like this
$$\max{}^k$$
When I use this, with long superscript
$$\max_{j = 1, \ldots , k}{}^k$$
it doesn't look nice, because k is to far ...

It works nice.
Thanks.

I tried to uninstall previous tex version from add/remove programs, and it didn't work. I had two directories with tex: "C:\localtexmf","C:\texmf" and I not delete it. So, I install MikTex 2.7 on "C:\Program Files\MiKTeX 2.7", and in MikTex Option I add path to new version. Now, it's working except ...

I look at my.log file and I find lines that contains xcolor
C:\texmf\tex\latex\xcolor\xcolor.sty
...
C:\texmf\tex\latex\pgf\xxcolor.sty

After second line there is Option clash... Probably, latex load xcolor package more than once automatically, so I really don't know how to solve problem. I ...

I want to remove this line, but it doesn't exist, neither in my tex file, nor in the mybeamersettings.tex. In mybeamersettings there are only two lines with usepackage:
\usepackage[english]{babel}
\usepackage{listings,amsmath,multimedia}
I didn't make the presentation, I'd downloaded the example ...

I have the similar problem. I follow instruction from site http://faculty.csuci.edu/jorge.garcia/tex/beamer.htm to install beamer, a test beamer with their template.txt from site. I got the same error "! LaTeX Error: Option clash for package xcolor..." .
template.txt :

\documentclass[t]{beamer ...