9-4-1.tex

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% 9-4-1.tex
\documentclass{article}
\usepackage{CJK}
\newcommand*{\HEI}{\CJKfamily{hei}}
\newcommand*{\KAI}{\CJKfamily{kai}}
\newtheorem{theorem}{Theorem}[section]
\begin{CJK}{GBK}{song}
\newtheorem{dingli}{\HEI定理}[section]
\end{CJK}
\begin{document}
\begin{theorem}[Fermat] There do not exist integers $n>2$, $x$, $y$, and $z$
such that $x^n+y^n=z^n$.
\end{theorem}

\begin{CJK*}{GBK}{song}
\CJKtilde
\begin{dingli}[{\HEI费马}]
{\upshape\KAI不存在使得~$x^n+y^n=z^n$~的整数~$n>2$、$x$、$y$~以及~$z$.}
\end{dingli}
\end{CJK*}
\end{document}