\documentclass[12pt]{amsart}

\usepackage{ljm-auth}

\author{I.\,Johnson}
\crauthor{I.\,Johnson} % for running heads

\tit{One problem concerning...}
\shorttit{One problem} %for running heads

\setcounter{page}{3}

\begin{document}

\maketit

\abstract{In this paper we consider ...} \notes{0}{

\subclass{46L51, 46L53, 46E30, 46H05}%
\keywords{Hilbert space, von Neumann algebra}%
\thank{Partially supported by Russian Foundation for Basic
Research, Grant 123-456}}

\section{Introduction}
Text....


\end{document}

.