Update math-style option (#23)

* Update `math-style` option * Update math equation test cases * Use `cmupint` with `mathptmx` Co-authored-by: LogCreative <logcreative@outlook.com>
sjtug · Jan 6, 2023 · 113b8a0 · 113b8a0
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diff --git a/sjtutex/doc/sample-article-zh.tex b/sjtutex/doc/sample-article-zh.tex
@@ -31,6 +31,10 @@ \section{主要方法}
 
 \zhlipsum[4-5]
 
+\begin{equation}
+  \int_{a}^b f(x)\,\mathrm{d}x=\lim_{|P|\rightarrow 0}\sum_{i=1}^n f(\xi_i)\increment x_i
+\end{equation}
+
 \section{测试结果}
 
 \zhlipsum[6]