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```tex
\documentclass[a4paper,UTF8,twoside]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{tikz-cd}
\usepackage[heading=true]{ctex}
\usepackage[margin=20mm]{geometry}
\begin{document}
\section{}
\begin{tikzcd}
A\arrow[r,"\phi"] \arrow[rd] &B\\
&C
\end{tikzcd}
\begin{tikzcd}
A\arrow[r,"\phi"]\arrow[d,red] &B\arrow[d,"\psi" red]\\
C\arrow[r,"\eta" blue] &D
\end{tikzcd}
\begin{tikzcd}
A\arrow[r,"\phi"]\arrow[d,red,"x","y"'] &B\arrow[d,"\psi" red]\\
C\arrow[r,"\eta" blue] &D
\end{tikzcd}
\begin{tikzcd}
A\arrow[r, "\phi" near start, "\psi"', "\eta" near end] &B
\end{tikzcd}
\begin{tikzcd}
A\arrow[r, "\phi" very near start, "\psi"', "\eta" very near end] &B
\end{tikzcd}
\begin{center}
\begin{tikzcd}
A\arrow[r, "\phi" very near start, "\psi"', "\eta" very near end] &B
\end{tikzcd}
\end{center}
\section{}
\begin{tikzcd}
T\arrow[rrd, bend left, "x"] \arrow[rd, dotted, "{(x,y)}"] \arrow[rdd, bend right, "y"] & &\\
&X\times_Z Y\arrow[r,"p"] \arrow[d,"q"] &X\arrow[d,"f"]\\
&Y\arrow[r,"g"] &Z
\end{tikzcd}
\begin{tikzcd}
T\arrow[rrd, bend left, "x"] \arrow[rd, dotted, "{(x,y)}" description] \arrow[rdd, bend right, "y"] & &\\
&X\times_Z Y\arrow[r,"p"] \arrow[d,"q"] &X\arrow[d,"f"]\\
&Y\arrow[r,"g"] &Z
\end{tikzcd}
\begin{tikzcd}
T\arrow[rrd] \arrow[rrd, bend left, "x"] \arrow[rd, dotted, "{(x,y)}" description] \arrow[rdd] \arrow[rdd, bend right, "y"] & &\\
&X\times_Z Y\arrow[r,"p"] \arrow[d,"q"] &X\arrow[d,"f"]\\
&Y\arrow[r,"g"] &Z
\end{tikzcd}
\begin{displaymath}
qqq
\end{displaymath}
```
有以下三个问题：
1.居中显示采用center环境，是最佳方案吗？
2.如何让section2的三个交换图横向并排？
3.如何实现左侧是交换图，右侧是其他的内容？比如，最下面的displaymath环境直接在图表的下方，请问如何让其在图表的右侧？
谢谢！
1 回答
1
你这个文档是 `tikz-cd`的练习习作，不是排版的作品，因此：
1. 很难说 `center` 是不是最佳方案，你需要知道的是 `center` 环境本质上是一个 `list`，因此它和上下文之间都有额外的间距。在你实际需要完成的作品中是不是需要这个间距，得你自己来判断。
2. section 2 的三个交换图之间不留空行分段就都在一个段落里，一行正好能放得下。当然你可以把它们各自放到 `minipage` 里，用并排排列 `minipage` 的方法实现并排、对齐等等。
3. 用两个并排的 `minipage` 就可以了。用你的一个图做个MWE
```tex
\documentclass{article}
\usepackage{amsmath,amssymb}
\usepackage{tikz-cd}
\begin{document}
\begin{minipage}{0.45\linewidth}
\centering
\begin{tikzcd}
T\arrow[rrd, bend left, "x"] \arrow[rd, dotted, "{(x,y)}"] \arrow[rdd, bend right, "y"] & &\\
&X\times_Z Y\arrow[r,"p"] \arrow[d,"q"] &X\arrow[d,"f"]\\
&Y\arrow[r,"g"] &Z
\end{tikzcd}
\end{minipage}\hfill
\begin{minipage}{0.45\linewidth}
\begin{displaymath}
x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}
\end{displaymath}
\end{minipage}
\end{document}
```
btw: 代码贴的时候要贴全，为啥少了 `\end{document}` 呢？
-
非常感谢! – Mso1124 2020-04-09 19:58 回复
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