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答案1
使用此代码
\documentclass[]{article}
\usepackage{mathtools, amsfonts}
\begin{document}
$\sqrt{I} = \{a \in R \mid \, a^n \, \in I, \exists n\in \mathbb{N}\}$
\end{document}
使用此代码
\documentclass[]{article}
\usepackage{mathtools, amsfonts}
\begin{document}
$\sqrt{I} = \{a \in R \mid \, a^n \, \in I, \exists n\in \mathbb{N}\}$
\end{document}