S2×R 中线段的等光面 documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts} （我们的软件包{amsfonts}）。\usepackage{amssymb} （我们的软件包{amssymb}）。\usepackage{amsbsy} \usepackage{mathrsfs}\usepackage{upgreek} （上希腊语\setlength\oddsidemargin}{-69pt} （长度设置{-69pt}）。\begin{document}$$textbf{S}^2（！）times （！textbf{R}$

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