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确实没有错误。

\documentclass{xdupgthesis}
\usepackage{amsmath}
\begin{document}
\begin{equation}
P(c_i=x|c_{i-1}=v)=
\begin{cases}
\frac{\pi_{vx}}{Z} & \text{if } (v,x)\in E \\
0                  & \text{otherwise}      \\
\end{cases}
\end{equation}
\end{document}

建议缩减代码,定位错误。

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@ppppls115
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@note286
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@ppppls115
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@note286
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Answer selected by note286
@ppppls115
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