1

How to compact the size of text written upper an arrow in tikz-cd?

\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz-cd}
\usetikzlibrary{arrows, matrix}
\tikzcdset{every label/.append style = {font = \tiny}}
\begin{document}
\[\begin{tikzcd}
0\rar & \mathrm{Hom}_R(L, E) \arrow{r}{\mathrm{Hom}(\beta, \mathrm{id}_E)} & \mathrm{Hom}_R(N, E) \arrow{r}{\mathrm{Hom}(\alpha, \mathrm{id}_E)} & \mathrm{Hom}_R(M, E)
\end{tikzcd}\]
\end{document}
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3 Answers 3

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1

You can scale it to any size 

\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz-cd}
\usetikzlibrary{arrows, matrix}
\tikzcdset{every label/.append style = {scale=0.5,yshift=0.2ex}}
\begin{document}
\[\begin{tikzcd}
0\rar & \mathrm{Hom}_R(L, E) \arrow{r}{\mathrm{Hom}(\beta, \mathrm{id}_E)} & \mathrm{Hom}_R(N, E) \arrow{r}{\mathrm{Hom}(\alpha, \mathrm{id}_E)} & \mathrm{Hom}_R(M, E)
\end{tikzcd}\]
\end{document}

enter image description here

but I personally would rather increase the distance between the columns as suggested by Joule V.

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6
  • thank you all. How ever i mean how to reduce the distance between the letters in for all text upper the arrow.
    – H.Gorbanzad
    May 18, 2019 at 14:40
  • @H.Gorbanzad Do you really think that there is substantial space between the letters? You could do \tikzcdset{every label/.append style = {xscale=0.5,yshift=0.2ex}} but this doesn't look good IMHO.
    – user121799
    May 18, 2019 at 14:43
  • Dear friend i really mean to reduce the space between the letters.
    – H.Gorbanzad
    May 18, 2019 at 14:55
  • Is it possible?
    – H.Gorbanzad
    May 18, 2019 at 15:07
  • @H.Gorbanzad How about \documentclass{article} \usepackage{amsmath} \usepackage{tikz-cd} \usetikzlibrary{arrows, matrix} \tikzcdset{every label/.append style = {scale=0.6,yshift=0.2ex}} \begin{document} \[\begin{tikzcd} 0\rar & \mathrm{Hom}_R(L, E) \arrow{r}{\mathrm{Hom}\!(\!\beta\!, \mathrm{id}\!_E\!)} & \mathrm{Hom}_R(N, E) \arrow{r}{\mathrm{Hom}(\alpha, \mathrm{id}_E)} & \mathrm{Hom}_R(M, E) \end{tikzcd}\] \end{document} ?
    – user121799
    May 18, 2019 at 15:14
2

You just have to enlarge the column width.

\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz-cd}
\usetikzlibrary{arrows, matrix}
\tikzcdset{every label/.append style = {font = \tiny}}
\begin{document}
\[\begin{tikzcd}[column sep=1.5cm]
0\rar & \mathrm{Hom}_R(L, E) \arrow{r}{\mathrm{Hom}(\beta, \mathrm{id}_E)} & \mathrm{Hom}_R(N, E) \arrow{r}{\mathrm{Hom}(\alpha, \mathrm{id}_E)} & \mathrm{Hom}_R(M, E)
\end{tikzcd}\]
\end{document}
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1

I wouldn't use tikzcd for this. Anyway, by reducing the font size and enlarging the column separation you get some result. Below I also show how I'd do it.

\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz-cd}

\DeclareMathOperator{\Hom}{Hom}
\newcommand{\id}{\mathrm{id}}

\begin{document}
\[
\begin{tikzcd}[column sep=large]
0\arrow[r] &
\Hom_R(L, E) \arrow[r,"{\scriptscriptstyle\Hom(\beta, \id_E)}"] &
\Hom_R(N, E) \arrow[r,"{\scriptscriptstyle\Hom(\alpha, \id_E)}"] &
\Hom_R(M, E)
\end{tikzcd}
\]

\[
0\longrightarrow
\Hom_R(L, E) \xrightarrow{\Hom(\beta, \id_E)}
\Hom_R(N, E) \xrightarrow{\Hom(\alpha, \id_E)}
\Hom_R(M, E)
\]

\end{document}

enter image description here

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