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Acta Mathematica Hungarica
Authors:
Z. Hou
and
D. Yang
Abstract
We completely classify Lorentzian surfaces with parallel mean curvature vector in \documentclass{aastex}
\usepackage{amsbsy}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{bm}
\usepackage{mathrsfs}
\usepackage{pifont}
\usepackage{stmaryrd}
\usepackage{textcomp}
\usepackage{upgreek}
\usepackage{portland,xspace}
\usepackage{amsmath,amsxtra}
\usepackage{bbm}
\pagestyle{empty}
\DeclareMathSizes{10}{9}{7}{6}
\begin{document}
$$\mathbb{E}_2^4$$
\end{document} . The main result states that there exist 22 families of such surfaces.
