\documentclass{as}

% leave it blanck, you dont know these infos yet
%
\yearnumber{xxxx}\volumenumber{xx}

\begin{document}

%article subject
\subject{My subject}

% select the article language among: english, french, italian
%
\selectlanguage{english}%



%insert here : Short title, full title and author
\articolo[Short title]{Full title of the article}{Name Surname}

%AMS for the article - example
\amsnote{
{\sl Mathematics Subject Classification 2000}:  01-02, 26-03, 26D15, 26A51.}

%Author note: please insert author name and surname in capital letters; 
%only surname in capital letter for Soci presentatori
\begin{authornote}
Author note; author name and surname in capital letters. use \symbolfootnote[1]{Department of xxxxxxxxx, University of Xxxxxxxx, Address, CAP City, Country.\\
\indent E-mail:~~{\tt name@domain.xx} to insert a note in this environment.}
\\
You can use newlines in the environment.
\end{authornote}

%abstract in english and italian

\begin{abstract}
Insert here the abstract for your article.
%article keyword
\smallskip
%insert keywords comma separated,  lower case
\noindent{\rm Keywords}: {\rm bla, bla, bla.} 
\end{abstract}
\medskip

\begin{riassunto}
Riassunto dell'articolo.

\smallskip
\noindent{\rm Parole chiave}: {\rm bla, bla, bla.} 
\end{riassunto}  

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section{Title of the first section.}
Use footnotemark and footnotetext for footnotes or the command footnote.\\
Here is the example of a environnement:

\begin{theorem} 
My first theorem.
\end{theorem}
\begin{proof}
Proof ot the theorem.
\end{proof}

Use the same for lemma, definition, \ldots.

Now let's go on the other page to check the look (different from the first.)
\newpage
and more a new one
\newpage


\begin{thebibliography}{99}
% Examples 

\bibitem{NS}
{\sc Ni W.M. and  Serrin J.}, 
\emph{{Nonexistence theorems for quasilinear partial differential equations}}, 
Rend. Circolo Mat. Palermo, Series II, \textbf{8} (1985), 171--185.

\bibitem{PY}
{\sc Polacik P. and  Yanagida E.},  
\emph{A Liouville property and quasiconvergence
for a semilinear equation}, J. Diff. Eqn.  \textbf{208} (2005), 194--214.

\bibitem{PZ}
{\sc Papini D. and  Zanolin F.}, 
\emph{Chaotic dynamics for non-linear Hill's equation}, 
Georgian Math. J. \textbf{9} (2002).

\end{thebibliography}

\end{document}