答案1
为什么tikz-cd
?
\documentclass[tikz,border=3.14mm]{standalone}
\begin{document}
\begin{tikzpicture}
\node[circle,fill,scale=0.3,label=right:$x$] (x1) at (0,0) {};
\node[circle,fill,scale=0.3,label=right:$y$] (y1) at (2,0) {};
\node[circle,fill,scale=0.3,label=left:$x$] (x2) at (4,0) {};
\draw[-latex] (0,-4) -- (0,4) node[left,yshift=-1cm]{$\gamma$};
\draw[-latex] (2,-4) -- (2,-0.5) arc(270:90:0.5) -- (2,4)
node[left,yshift=-1cm]{$\gamma'$};
\draw[-latex] (4,-4) -- (4,-0.5) arc(-90:90:0.5) -- (4,4)
node[left,yshift=-1cm]{$\gamma''$};
\end{tikzpicture}
\end{document}