\documentclass[11pt, a4paper]{article}
\usepackage{latexsym}
\usepackage{indentfirst}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{amssymb}
\newtheorem{defi}{Definition}[section]
\newtheorem{exam}{Example}[section]
\newtheorem{lem}{Lemma}[section]
\newtheorem{rem}{Remark}[section]
\newtheorem{thm}{Theorem}[section]
\newtheorem{prop}{Proposition}[section]
\newtheorem{coro}{Corolar}[section]
\newtheorem{nota}{Notation}[section]

\begin{document}
\title{A template for a paper to be submitted to\\ ROMAI Journal}
\author{First Author's Full Name, Second Author's Full Name,... \\
First Author's Affiliation (Institution, Town, Country)\\
Second Author's Affiliation (Institution, Town, Country)... \\e-mail
address(es)}

\date{}
\maketitle

\begin{abstract}
Here the abstract of the paper should be placed. It should not be
very extended,
at most 10 lines.\\
\textbf{Key words}: template, Latex file.\\
\textbf{2000 AMS subject classifications}: 97U99.
\end{abstract}

\section{Introduction}
The paper should begin with an Introduction.

\section{On editing definitions, theorems, propositions, lemmata, corolaries}

In order to write a definition, please use the command (see the .tex
file)
\begin{defi}\label{AND1} This is a definition of a mathematical object.
\end{defi}

For a theorem, use (see the .tex file)
\begin{thm} In the conditions of Definition (\ref{AND1}), the following
assertions hold\\
a)...\\
b).....
\end{thm}
\textbf{Proof. }The proof is written here.$\Box$

For the other types of mathematical assertions, please use the
commands defined  in the preamble of the Latex template.

\section{On inserting a matrix, a table, a figure}

We present the above topics one by one.
\subsection{A $m\times n$ matrix}

In order to edit a  $4\times 3$ matrix, we may use (see the .tex
file)
$$\left(%
\begin{array}{ccc}
  a_{11} & a_{12} & a_{13} \\
  a_{21} & a_{22} & a_{23} \\
  a_{31} & a_{32} & a_{33} \\
  a_{41} & a_{42} & a_{43} \\
\end{array}%
\right).
$$

\subsection{A table}

In order to edit a  $4\times 3$ table, you may use (see the .tex
file)
$$\begin{tabular}{|c|c|c|}
  \hline
  % after \\: \hline or \cline{col1-col2} \cline{col3-col4} ...
  Column 1 & Column 2 & Column 3 \\
  \hline
  $a_{11}$ & $a_{12}$ & $a_{13}$ \\
  $a_{21}$ & $a_{22}$ & $a_{23}$ \\
  $a_{31}$ & $a_{32}$ & $a_{33}$ \\
  \hline
\end{tabular}
$$

\subsection{Inserting a figure in the document}
In order to insert a figure in your paper, please use an instruction
similar to the one below (in the tex source file).

\begin{figure}
   \centering
   \includegraphics[height=7cm,width=7cm]{gridFVM.eps}
   \caption{Rectangular mesh (from \cite{ANCLB}). }
   \label{norma_fig}
\end{figure}

\textbf{Very important} The files containing figures must be .eps
files.

\section{On labels}

Please add to the labels of equations, figures, tables, definitions,
theorems and so on, the initials of one of the authors. This will
ease the process of putting the papers together in the volume (the
probability of finding two identical labels in two different papers
will be lowered).

\section{On new commands}
Please do not use your own commands, even if they might be
 much simpler than the pre-defined ones. This will help the work of
 editing ROMAI Journal.

\section{On the references}
The references should be in AMS format, as below.

\begin{thebibliography}{99}

\bibitem{ANCLB} C. L. Bichir, \textit{A numerical study by FEM and FVM of a problem which
presents a simple limit point}, ROMAI J., \textbf{4}, 2(2008),
45-56.

\bibitem{ANPT} R. Peyret, T. D. Taylor, \textit{Computational methods for fluid
flow}, Springer, Berlin, 1983.

\end{thebibliography}
















\end{document}