\documentclass[uplatex,a4j,10pt]{jsarticle}
\usepackage{fancybox,boxedminipage,ascmac}
\usepackage{amsmath,amsthm,amssymb,bm}
\usepackage{amsfonts,amscd,mathrsfs}
\usepackage{cases,physics}
\usepackage[dvipdfmx]{graphicx}
\usepackage[all]{xy}
\usepackage{tikz,tikz-cd}
\usetikzlibrary{shadows}
\usepackage{multicol}
\usepackage[version=3]{mhchem}
\usepackage{tcolorbox}
\tcbuselibrary{raster,skins}
\renewcommand{\labelenumi}{[\ \arabic{enumi}\ ]\ \ }
\setlength{\textwidth}{15cm}
\setlength{\oddsidemargin}{-1.0cm}
\setlength{\evensidemargin}{-1.0cm}
\setlength{\topmargin}{-2cm}
\setlength{\textheight}{24cm}
\begin{document}
\begin{center}
\textbf{tikz-cdの使い方}\ (2020/07/05) \\
\end{center}
\begin{tikzcd}
A \arrow[rd] \arrow[r, "\phi"] & B \\
& C
\end{tikzcd}
\begin{tikzcd}
A \arrow[r, "\phi"] \arrow[d, red]
& B \arrow[d, "\psi" red] \\ C \arrow[r, red, "\eta" blue]
& D
\end{tikzcd}
\begin{tikzcd}
A \arrow[r, "\phi" near start, "\psi"', "\eta" near end] & B
\end{tikzcd}
\begin{tikzcd}
T
\arrow[drr, bend left, "x"]
\arrow[ddr, bend right, "y"]
\arrow[dr, dotted, "{(x,y)}" description] & & \\
& X \times_Z Y \arrow[r, "p"] \arrow[d, "q"] & X \arrow[d, "f"] \\
& Y \arrow[r, "g"] &Z
\end{tikzcd}
\begin{tikzcd}[column sep=tiny]
& \pi_1(U_1) \ar[dr] \ar[drr, "j_1", bend left=20]
&
&[1.5em] \\
\pi_1(U_1\cap U_2) \ar[ur, "i_1"] \ar[dr, "i_2"']
&
& \pi_1(U_1) \ast_{ \pi_1(U_1\cap U_2)} \pi_1(U_2) \ar[r, dashed, "\simeq"]
& \pi_1(X) \\
& \pi_1(U_2) \ar[ur]\ar[urr, "j_2"', bend right=20]
&
&
\end{tikzcd}
\begin{tikzcd}[row sep=scriptsize, column sep=scriptsize]
& f^* E_V \arrow[dl] \arrow[rr] \arrow[dd] & & E_V \arrow[dl] \arrow[dd] \\
f^* E \arrow[rr, crossing over] \arrow[dd] & & E \\
& U \arrow[dl] \arrow[rr] & & V \arrow[dl] \\
M \arrow[rr] & & N \arrow[from=uu, crossing over]\\
\end{tikzcd}
\begin{tikzcd}
A \arrow[r]
& B \arrow[r]
\arrow[d, phantom, ""{coordinate, name=Z}]
& C \arrow[dll, "\delta",
rounded corners,
to path={ -- ([xshift=2ex]\tikztostart.east)
|- (Z) [near end]\tikztonodes
-| ([xshift=-2ex]\tikztotarget.west) -- (\tikztotarget)}] \\
D \arrow[r]
& E \arrow[r]
& F
\end{tikzcd}
\end{document}
