i have 2 problems here.

1.

how to put the authors' addresses right after the authors' name?

also, to label the authors name by 1,2,3,....

after the addresses, i need to put "abstract", then "subject classification", finally "keywords".

All "authors' addresses+abstract+subject classification+keywords" must be before the first section "Introduction".

2.

This is a part of my output:

**2. HNN extensions **

**Definition 1. **

**Definition 2.**

**Lemma 1.**

**Theorem 1.**

How to make it become:

**2. HNN extensions (each section allign to the left)**

**Definition 2.1. **

**Definition 2.2.**

**Lemma 2.1.**

**Theorem 2.1.**

This is my tex:

\documentclass[12pt]{amsart}

\usepackage{amssymb, latexsym}

\theoremstyle{plain}

\newtheorem{theorem}{Theorem}

\newtheorem{lemma}{Lemma}

\newtheorem{proposition}{Proposition}

\newtheorem{definition}{Definition}

\newtheorem{corollary}{Corollary}

\newtheorem{notation}{Notation}

\numberwithin{equation}{section}

\begin{document}

\title{}

\author{}

\address{}

\email{}

\author{}

\address{}

\email{}

\author{}

\address{}

\email{}

\keywords{}

\subjclass[2000]{Primary: ; Secondary }

\date{November 2010}

\begin{abstract}

In this note, we show that

\end{abstract}

\maketitle

\section{\bf Introduction}

\section{\bf HNN extensions}

\begin{definition}

\end{definition}

\begin{definition}

\end{definition}

\begin{lemma}

\end{lemma}

\begin{theorem}

\end{theorem}