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\usepackage{amsmath,luatexja-fontspec,unicode-math}
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\begin{document}
\section{注记：数学模式下的日文字符}
p\TeX 支持在数学模式下的日文字符，如以下源码：
$f_{高温}$~($f_{\text{high temperature}}$).
\[ y=(x-1)^2+2\quad よって\quad y>0 \]
$5\in 素:=\{\,p\in\mathbb N:\text{$p$ is a prime}\,\}$.
\end{document}
