如果\item(in \begin{enumerate) 包含很长的一行，我需要添加换行符，以便其余部分转到另一行（但枚举号相同）。在下面的代码中，我添加了\allowbreak希望将其余部分换行到新行，但它不起作用。我该怎么做？谢谢。
\begin{enumerate}
\item $T(\phi_{1}(x)\barwedge\left(\phi_{2}(y)\veebar\phi_{3}(z)\right))\,=\,T(\left(\phi_{1}(x)\barwedge\phi_{2}(y) \right) \veebar\left(\phi_{1}(x)\barwedge\phi_{3}(z)\right))$, \quad\allowbreak $T(\phi_{1}(x)\veebar \left(\phi_{2}(y)\barwedge\phi_{3}(z)\right))\,=\, T(\left(\phi_{1}(x)\veebar\phi_{2}(y)\right)\barwedge \left(\phi_{1}(x)\veebar\phi_{3}(z)\right))$.
\end{enumerate}
答案1
如果您只想要换行符，您可以添加\\而不是\quad\allowbreak。
如果您想要两个具有相同编号的列表项，则可以使用\item\setcounter{enumi}{1}“1”进行设置，其中“1”应该是比您想要的数字小一的数字。
以下是包含两个选项的 MWE：
\documentclass[]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\begin{document}
\begin{enumerate}
\item $T(\phi_{1}(x)\barwedge\left(\phi_{2}(y)\veebar\phi_{3}(z)\right))\,=\,T(\left(\phi_{1}(x)\barwedge\phi_{2}(y) \right) \veebar\left(\phi_{1}(x)\barwedge\phi_{3}(z)\right))$\\$T(\phi_{1}(x)\veebar \left(\phi_{2}(y)\barwedge\phi_{3}(z)\right))\,=\, T(\left(\phi_{1}(x)\veebar\phi_{2}(y)\right)\barwedge \left(\phi_{1}(x)\veebar\phi_{3}(z)\right))$.
\end{enumerate}
\hrule
\begin{enumerate}
\item\setcounter{enumi}{0} $T(\phi_{1}(x)\barwedge\left(\phi_{2}(y)\veebar\phi_{3}(z)\right))\,=\,T(\left(\phi_{1}(x)\barwedge\phi_{2}(y) \right) \veebar\left(\phi_{1}(x)\barwedge\phi_{3}(z)\right))$
\item $T(\phi_{1}(x)\veebar \left(\phi_{2}(y)\barwedge\phi_{3}(z)\right))\,=\, T(\left(\phi_{1}(x)\veebar\phi_{2}(y)\right)\barwedge \left(\phi_{1}(x)\veebar\phi_{3}(z)\right))$.
\item This is the third item
\item This is the fourth item
\end{enumerate}
\hrule
\begin{enumerate}
\item This is the first item
\item This is the second item
\item\setcounter{enumi}{2} $T(\phi_{1}(x)\barwedge\left(\phi_{2}(y)\veebar\phi_{3}(z)\right))\,=\,T(\left(\phi_{1}(x)\barwedge\phi_{2}(y) \right) \veebar\left(\phi_{1}(x)\barwedge\phi_{3}(z)\right))$
\item $T(\phi_{1}(x)\veebar \left(\phi_{2}(y)\barwedge\phi_{3}(z)\right))\,=\, T(\left(\phi_{1}(x)\veebar\phi_{2}(y)\right)\barwedge \left(\phi_{1}(x)\veebar\phi_{3}(z)\right))$.
\item This is the fourth item
\item This is the fifth item
\end{enumerate}
\end{document}
我提供了两个版本的选项，\setcounter\enumi{}以便您更好地了解其工作原理。
