Latex报错Missing $ inserted.inserted text

我的个人博客：zhang0peter的个人博客

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今天晚上在用Latex写文章，编译时报错：

Missing $ inserted.
<inserted text> 

我尝试在overleaf上编译，报错为：

Check that your $'s match around math expressions. If they do, then you've probably used a symbol in normal text that needs to be in math mode. Symbols such as subscripts ( _ ), integrals ( \int ), Greek letters ( \alpha, \beta, \delta ), and modifiers (\vec{x}, \tilde{x} ) must be written in math mode. See the full list here.If you intended to use mathematics mode, then use $ … $ for 'inline math mode', $$ … $$ for 'display math mode' or alternatively \begin{math} … \end{math}.

我仔细看了后发现是因为我原文中用到了下划线，也就是_，我原文中写的是min_df，但是下划线在latex中是有特殊含义的，所以如果想使用下划线只能这样用：

\underline{\space}

还有一种解决方案就是使用

\_

替代_