答案1
希望这能帮助你入门。
我对此并没有任何专业知识tikz-cd
,实际上这是我第一次尝试。
输出
输出
\documentclass[12pt,tikz]{standalone}
\usepackage{mathrsfs} % for the mathscr
\usepackage{tikz-cd}
\begin{document}
\begin{tikzcd}
\mathscr{C}
\arrow[r, bend left=50, ""{below=-3pt,name=U}, "\mathcal{F}"{very near end, inner sep=1pt}]
\arrow[r, ,"\mathcal{G}"{very near start, inner sep=1pt}, "" {below=-3pt,name=M}]
\arrow[r, bend right=50, ""{below=-3pt,name=D}, "\mathcal{H}"{very near end,below}]
& \mathscr{D}
% the downwards arrows
\arrow[Rightarrow, from=U, to=M, "\alpha"]
\arrow[Rightarrow, from=M, to=D, "\beta"]
\end{tikzcd}
\end{document}