如何删除表格前后不必要的间距？

Question

例子：

Let A = \{$\alpha$,$\beta$,$\psi$\} be a set operates on $\star$ then

\begin{table}
\centering
\begin{tabular}{l|lll}
\textbf{$\star$} & \textbf{$\alpha$} & \textbf{$\beta$} &\textbf{$\gamma$}\\
\hline
$\alpha$ & $\alpha$ & $\alpha$ & $\alpha$ \\
$\beta$  & $\beta$  & $\beta$  & $\beta$  \\
$\gamma$ & $\gamma$ & $\gamma$ & $\gamma$ \\
\end{tabular}
\end{table}

Further text.

我想删除表格前后不必要的额外间距。

Answer 1

table如果不需要，请不要使用环境：

 \documentclass{article}
\begin{document}

  \begin{enumerate}
    \item Set of an integer is closed under $+$ , $-$ , $\times$ operator.
    \item Set of an integer is not closed under $/$ operator.
  \end{enumerate}

Let A = \{$\alpha$,$\beta$,$\psi$\} is a set operates on $\star$ then

\begin{tabular}{l|lll}
\textbf{$\star$} & \textbf{$\alpha$} & \textbf{$\beta$} &\textbf{$\gamma$}\\
\hline
$\alpha$ & $\alpha$ &$\alpha$ &$\alpha$\\
$\beta$ & $\beta$ &$\beta$ &$\beta$\\
%\midrule
$\gamma$ & $\gamma$ &$\gamma$ &$\gamma$\\
\end{tabular}

\end{document}

如果您希望表格居中，请使用：

{\centering
\begin{tabular}{l|lll}
\textbf{$\star$} & \textbf{$\alpha$} & \textbf{$\beta$} &\textbf{$\gamma$}\\
\hline
$\alpha$ & $\alpha$ &$\alpha$ &$\alpha$\\
$\beta$ & $\beta$ &$\beta$ &$\beta$\\
%\midrule
$\gamma$ & $\gamma$ &$\gamma$ &$\gamma$\\
\end{tabular}\par}

Answer 2

使用

\begin{center}
\begin{tabular}{l|lll}
...
\end{tabular}
\end{center}

而不是table环境。