乳胶文档上的推理对齐规则

Question

嗨，我正在尝试一步一步地描述推理规则，就像下面的图片一样

好像有 3 列，并且每列都居中对齐。

这个表格只是用表格而没有线条吗？如果有谁有写命题逻辑文档的经验，请给点建议。谢谢

Answer 1

@Werner 提供的解决方案如下--https://tex.stackexchange.com/a/410766/197451

提供了两种证明环境：

证明A

和

证明B

第一个使用常规的tabular，第二个使用tabularx允许两端对齐的段落文本的。

平均能量损失

\documentclass{article}

\usepackage{tabularx}

\newcounter{proofstep}
\newcommand{\step}{}
\newenvironment{proofA}
  {\par
   \setcounter{proofstep}{0}%
   \renewcommand{\step}{\refstepcounter{proofstep}\theproofstep. &}%
   \noindent
   \begin{tabular}{ @{} r c l @{}}}
  {\end{tabular}}
\newenvironment{proofB}
  {\par
   \setcounter{proofstep}{0}%
   \renewcommand{\step}{\refstepcounter{proofstep}\theproofstep. &}%
   \noindent
   \tabularx{\textwidth}{ @{} r c X @{} }}
  {\endtabularx}

\begin{document}

\noindent
\begin{tabular}{ @{} r c l @{} }
  1. & some math & Justification. \\
  2. & some math & Justification.
\end{tabular}

\begin{proofA}
  \step some math & Justification. \\
  \step some math & Justification.
\end{proofA}

\begin{proofB}
  \step some math & This is just another sentence that will span at least two 
   lines. Well, now it will, for sure! \\
  \step some math & Justification.
\end{proofB}

\end{document}

可以通过修改表格环境的代码来添加标题行，如下所示

\begin{tabular}{ @{} r c l @{} }
     & \textbf{Step} & \textbf{Reason}\\
  1. & some math     & Justification. \\
  2. & some math     & Justification.
\end{tabular}