使用 TikZ 绘制此图片

Question

如何使用 TikZ 绘制这幅图？

Answer 1

这是一个tikz-cd解决方案

\documentclass{article}

\usepackage{tikz-cd}
\newcommand{\e}{\varepsilon}

\begin{document}

\begin{tikzcd}[column sep=1.5cm, cells={nodes={draw, circle, inner sep=.5mm}}]
|[draw=none]|\arrow[r] & q_0\arrow[r,"{a,\e\to a}"] & q_1\arrow[r,"{\e,\e\to\e}"]\arrow[<-,loop above,"{a,\e\to a}"] 
    & q_2\arrow[r,"{\e,\e\to\e}"]\arrow[<-,loop above,"{b,\e\to\e}"] & q_3\arrow[r,"{c,a\to\e}"] 
    & q_4\arrow[r,"{c,\e\to\e}"] & |[double]|q_5\arrow[ll, bend right,"{\e,\e\to\e}"']
\end{tikzcd}

\end{document}