\documentclass[12pt,reqno,a4paper]{amsart}
%\usepackage[utf8]{inputenc} % not needed with up-to-date TeX systems
\usepackage[english]{babel}
\usepackage{amsmath,amsthm,amsfonts,amssymb}
\usepackage{mathtools}
\usepackage{color}
\usepackage{mathrsfs}
\usepackage[all]{xy}
\usepackage{tikz-cd}
\usepackage[normalem]{ulem} % do you *really* need it?
\usepackage{datetime}
\usepackage{hyperref}
\theoremstyle{definition}
\newtheorem{theorem}{Theorem}[section]
\newtheorem{construction}{Construction}[section]
\newtheorem{corollary}{Corollary}[section]
\newtheorem{lemma}{Lemma}[section]
\newtheorem{definition}{Definition}
\newtheorem{remark}{Remark}[section]
\newtheorem{proposition}{Proposition}[section]
\newtheorem{example}{Example}
\newtheorem*{question}{Question}
\newtheorem*{solution}{Solution}
\newtheorem{exercise}{Exercise}
\newcommand{\mc}{\mathcal}
\newcommand{\mf}{\mathfrak}
\newcommand{\mb}{\mathbb}
\newcommand{\xra}{\xrightarrow}
\newcommand{\ra}{\rightarrow}
\newcommand{\rra}{\rightrightarrows}
\pagestyle{myheadings}
\textheight 9.3in
\textwidth 6.5in
\calclayout
% metadata
%\date{\today}
\title{Something}
\author{Someone}
\begin{document}
\[\begin{tikzcd}
0 \arrow[r] & A \arrow[rr] \arrow[dd] & & B \arrow[rr] \arrow[dd] & & C \arrow[r] \arrow[dd] & 0 \\
D \arrow[dd] \arrow[ru,xshift=0.75ex,"t"]
\arrow[ru,xshift=-0.75ex,"s"'] & & E \arrow[ru,xshift=0.75ex,"t"]
\arrow[ru,xshift=-0.75ex,"s"'] \arrow[dd] & & F \arrow[ru,xshift=0.75ex,"t"]
\arrow[ru,xshift=-0.75ex,"s"'] \arrow[dd] & & \\
& G & & H & & I & \\
J \arrow[ru,xshift=0.75ex,"t"]
\arrow[ru,xshift=-0.75ex,"s"'] & & K \arrow[ru,xshift=0.75ex,"t"]
\arrow[ru,xshift=-0.75ex,"s"'] & & L \arrow[ru,xshift=0.75ex,"t"]
\arrow[ru,xshift=-0.75ex,"s"'] & &
\end{tikzcd}\]
\end{document}
Oben ist das minimal funktionierende Beispiel.
Ich möchte, dass die Pfeile von D nach A, E nach B, F nach C und andere solche Pfeile an derselben Stelle beginnen und enden, genau wie bei der Verwendung von „\rightrightarrows“.
Wie mache ich das? Kommentare sind willkommen.
Antwort1
Verwenden Sie shift leftund shift rightanstelle von xshift.
\documentclass[12pt,reqno,a4paper]{amsart}
\usepackage{amsmath}
\usepackage{tikz-cd}
\begin{document}
\[
\begin{tikzcd}
0 \arrow[r] & A \arrow[rr] \arrow[dd] && B \arrow[rr] \arrow[dd] && C \arrow[r] \arrow[dd] & 0
\\
D \arrow[ru,shift right=0.75ex,"s"'] \arrow[ru,shift left=0.75ex,"t"] \arrow[dd] &&
E \arrow[ru,shift right=0.75ex,"s"'] \arrow[ru,shift left=0.75ex,"t"] \arrow[dd] &&
F \arrow[ru,shift right=0.75ex,"s"'] \arrow[ru,shift left=0.75ex,"t"] \arrow[dd]
\\
& G && H && I
\\
J \arrow[ru,shift right=0.75ex,"s"'] \arrow[ru,shift left=0.75ex,"t"] &&
K \arrow[ru,shift right=0.75ex,"s"'] \arrow[ru,shift left=0.75ex,"t"] &&
L \arrow[ru,shift right=0.75ex,"s"'] \arrow[ru,shift left=0.75ex,"t"]
\end{tikzcd}
\]
\end{document}
