\documentclass[12pt, reqno]{amsproc}
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\newtheorem{theorem}{\bf{Theorem}}[section] % 1st argument is your name for it
\newtheorem{lemma}[theorem]{\bf{Lemma}} % 2nd argument is what is printed
\newtheorem{corollary}[theorem]{\bf{Corollary}}
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\newtheorem{definition}{\bf{Definition}}[section]
\newtheorem{ex}[definition]{\bf{Example}}
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\title[Heading title]{Manuscript title}
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\author{the first author}
\address{Address of the first author}
\email{e-mail of the first author}
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\author{the second author$^*$}
\address{Address of the second author}
\email{e-mail of the second author}
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\keywords{Write your keywords\\
Corresponding author}
\subjclass[2010]{Primary: ----; Secondary: ----}
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\begin{document}
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{\begin{flushleft}\baselineskip9pt\scriptsize {\bf Mathematical Analysis and its Contemporary Applications}
\newline
Volume ---, Issue ---, 201--, .--.
\newline ISSN -----
\end{flushleft}}
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\vspace{1cm} \setcounter{page}{17} \thispagestyle{empty}
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\maketitle
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\begin{abstract}
Write your abstract here.
\end{abstract}
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\section{Introduction}
Let $A$ and $B$ be two Banach algebras such that
Cite your references as \cite{L1983, R2002}.
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\section{Write your Section 2 name}
\begin{lemma}\label{l1}
Let $A$ ..........
\end{lemma}
\begin{rem}\label{r1}
If ...............
\end{rem}
According to Lemma \ref{l1}, we have
\begin{theorem}\label{t1}
Let ..............
\end{theorem}
\begin{proof}
Suppose that ....
\end{proof}
\begin{proposition}\label{p1}
Let...............
\end{proposition}
\begin{corollary}
Let
\end{corollary}
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\section{Section 3}
Let
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\section*{Acknowledgment}
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\begin{thebibliography}{99}
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\bibitem{L1983}A. T.-M. Lau, \emph{Analysis on a class of Banach algebras with application to harmonic analysis on locally compact groups and semigroups}, Fund. Math., 118(1983), 161-175.
\bibitem{R2002}V. Runde, Lectures on amenability, Lecture Notes in Mathematics, Vol. 1774, Springer-Verlag, Berlin, 2002.
\end{thebibliography}
\end{document}