答案1
这是可以产生类似于您绘图的输出的东西。只有您向我们提供更多背景信息(即您尝试过的代码),才有可能确定一种非常好的方法来做这样的事情。
\documentclass[fleqn]{article}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{tikz}
\usetikzlibrary{tikzmark,decorations.pathreplacing,calligraphy}
\begin{document}
\begin{enumerate}
\item $\tikzmarknode{1}{N(L^*)=R(L^*)^\perp;}$
\item $\tikzmarknode{2}{{}^\perp N(L^*)=\overline{R(L)};}$
\item $\tikzmarknode{3}{{}^\perp N(L)={}^\perp R(L^*);}$
\item $\tikzmarknode{4}{{}N(L^*)=\overline{R(L^*)}^{n*};}$%
\begin{tikzpicture}[overlay,remember picture,
decoration={calligraphic brace,amplitude=4pt},very thick]
\path[local bounding box=top] (1.north east) -- (2.south east);
\draw[decorate] ([xshift=1ex]top.north east) -- ([xshift=1ex]top.south east)
node[midway,right=1ex]{$L$ is densely defined};
\path[local bounding box=bot] (3.north east) -- (4.south east);
\draw[decorate] ([xshift=1ex]bot.north east) -- ([xshift=1ex]bot.south east)
node[midway,right=1ex]{$L$ is closed graph};
\end{tikzpicture}
\end{enumerate}
\[\text{map}~\left\{\begin{array}{@{}l@{}l@{}}
\text{function}&\colon \mathbb{F}\to\mathbb{F}\\[1em]
\text{functional}&\colon C(\mathbb{F})\to\mathbb{F}\\[1em]
\text{operator}&\colon C(\mathbb{F})\to C(\mathbb{F})
\end{array}\right.\]
\end{document}