使用 Tikz 的路径图？

Question

我想制作这样的图表：

我怎样才能绘制这样一条“关节”路径？

Answer 1

一种方法是使用tikz-cd。

\documentclass{article}
\usepackage{geometry}
\usepackage{amsmath}
\usepackage{tikz-cd}
\begin{document}

\begin{tikzcd}[/tikz/column 1/.style={column sep=4em},
    /tikz/column 4/.style={column sep=4em},
    every arrow/.append style={-stealth,semithick}]
 & \text{divisor} \arrow[rr]& & \text{existence} 
 \arrow[dr,rounded corners=1em,to path={-- ++ (4em,0) |- (\tikztotarget)}]& \\
 \text{UFD} 
 \arrow[ur,rounded corners=1em,to path={-- ++ (4em,0) |- (\tikztotarget)}]
 \arrow[dr,rounded corners=1em,to path={-- ++ (4em,0) |- (\tikztotarget)}]
 & & & & \text{UFD} \\
 & \text{GCD}\arrow[r] & \text{primeness}\arrow[r,"" {marking,name=p,pos=0.8}] &
 \arrow[from=1-2,to=p,dash,out=0,in=180] 
 \text{uniqueness} 
 \arrow[ur,rounded corners=1em,to path={-- ++ (4em,0) |- (\tikztotarget)}]& \\
\end{tikzcd}
\end{document}