答案1
只需几分钟即可了解 手册tikz-cd
。执行texdoc tikz-cd
或前往http://texdoc.net/texmf-dist/doc/latex/tikz-cd/tikz-cd-doc.pdf
\documentclass{article}
\usepackage{tikz-cd}
\begin{document}
\[
\begin{tikzcd}[column sep=small]
&&& U \arrow[dl] \arrow[dr] \\
Z \arrow[rr] && X \arrow[rr] && Y
\end{tikzcd}
\]
\end{document}