\documentclass[11pt]{article} \usepackage{mathrsfs} \usepackage{amsfonts} \usepackage{amssymb,amsmath,amsthm} \newcommand{\R}{\mathbb{R}} \newcommand{\Z}{\mathbb{Z}} \newcommand{\N}{\mathbb{N}} \def\qed{\hfill $\Box$ \smallskip} \textheight 23cm \textwidth 14cm \def\baselinestretch{1.3} \oddsidemargin 0pt \evensidemargin 0pt \topmargin 0pt \renewcommand{\theequation}{\thesection.\arabic{equation}} \newcommand{\proofbox}{\hspace*{.2in}\raisebox{3pt} {\fbox{\rule{0pt}{.7pt}\rule{.7pt}{0pt}}}} \baselineskip 8pt \begin{document} \pagestyle{plain} \begin{center} {\Large Existence, multiplicity and asymptotical behavior of solutions of some nonlocal problems} {Speaker's name}\\ Department of Mathematics, Yunnan Normal University,\\ Kunming, China\\ {Email: \verb"zzz@163.com"} \end{center} \textbf{Abstract}: This talk is .... \end{document}