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如何改变括号的大小

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如何改变括号的大小 
\begin{document}

The algebraic system define over operator $\star$ , which is \emph{closed} and \emph{associative} is called SEMIGROUP.
The algebraic system define over operator $\star$ having property \emph{Closed}, \emph{Associative} and \emph{Identity} is  called MONOID.
\end{document}

我想写 1.closed 2.associative } semigroup 1.closed 2.associative 3.identity } monoid

我想在两行不同的行中写下 1.closed 2.associative，并将它们与长'}'符号组合并写成 semigroup 。

我怎样才能做到这一点？

答案1

以下一组嵌套array环境可能会实现您所寻找的内容：

\documentclass{article}
\usepackage{array,amsmath}
\begin{document}
$\begin{array}{@{} ll @{}}
   \left.\begin{array}{@{} ll @{}}
      \left. \begin{array}{@{} ll @{}}
         \text{1. closed}\\
         \text{2. associative}
      \end{array}\right\} & \text{semigroup}\\
                          & \text{3. identity}
   \end{array}\right\} & \text{monoid}
\end{array}$
\end{document}

在此处输入图片描述

答案2

您可以使用 TikZ 包创建绘图：

\documentclass[11pt]{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[line width = 0.7pt]
  \def\h{0.45} % height
  \foreach \i/\txt in {1/closed, 2/associative, 3/identity} {
    \node at (0,-\i*\h) {\i. \txt};
  }
  \node[align = right] at (-2.3,-1.5*\h) {semigroup \Big\{};
  \node[align = left ] at ( 2.1,-2.0*\h) {\Bigg\} monoid};
\end{tikzpicture}
\end{document}

在此处输入图片描述

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