答案1
点状图案实际上并不是最好的,但这可能是一个起点。
\documentclass{article}
\usepackage{tikz-cd}
\begin{document}
\begin{tikzcd}
& & & & \bullet \arrow[d] \arrow[r,"\xi"] & E_1 \arrow[d,"\eta"] \\
& & & \bullet \arrow[d] \arrow[r] & E_2 \arrow[d] \arrow[r] & \bullet \\
& & {} \arrow[r] & E_3 \arrow[d] \arrow[r] \arrow[lldd,-,loosely dotted]& \bullet \\
& {} \arrow[d] & & {}\\
\bullet \arrow[d,"\mu",swap] \arrow[r] & E_n \arrow[d] \arrow[r] & {} \\
\bullet \arrow[r,"\lambda",swap] & \bullet
\end{tikzcd}
\end{document}