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I want to write with tikz-cd a map, in such a way that the two arrows are aligned and have the same length. I got this by adding \phantom{} everywhere, but I wonder if there's a easier (smarter) way.

My attemp:

\documentclass{article} \usepackage{amsmath,amsthm,amssymb,amsfonts,amscd} \usepackage{tikz} \usepackage{tikz-cd} \usetikzlibrary{arrows} \begin{document} \begin{tikzcd}[row sep = 0ex] \tau : I \arrow[rightarrow]{r} & \mathbb{R} \phantom{---------} \\ \phantom{\tau :. } t \arrow[mapsto]{r} & \tau (t) := \displaystyle \int_{t_0}^{t} \sqrt{T \cdot T} \ \mathrm{d} s \end{tikzcd} \end{document}

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  • Do you need tikz-cd for that display to begin with? Commented Nov 6, 2016 at 11:18
  • @egreg I suppose I do not need tikz-cd precisely (though I would like), I just thought it was a good tool. What I need is to write maps, in that way. Commented Nov 6, 2016 at 11:31
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    \begin{aligned}\tau\colon I &\longrightarrow\mathbb{R}\\ t&\longmapsto \tau(t)...\end{aligned} Commented Nov 6, 2016 at 11:34

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You can do it with tikz-cd, but also with a simpler aligned:

\documentclass{article} \usepackage{amsmath,amssymb,amsthm} \usepackage{tikz} \usepackage{tikz-cd} \usetikzlibrary{arrows} \newcommand\diff{\mathop{}\!\mathrm{d}} \begin{document} \begin{tikzcd}[ row sep = 0ex, /tikz/column 1/.append style={anchor=base east}, /tikz/column 2/.append style={anchor=base west}, ] \tau\colon I \arrow[r] & \mathbb{R} \\ t \arrow[r,mapsto] & \tau (t) := \displaystyle \int_{t_0}^{t} \sqrt{T \cdot T} \diff s \end{tikzcd} $\begin{aligned} \tau\colon I & \longrightarrow \mathbb{R} \\ t & \longmapsto \tau (t) := \int_{t_0}^{t} \sqrt{T \cdot T} \diff s \end{aligned}$ \end{document}

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An align* environment will be much more flexible. B.t.w., you should use \colon, not : for a better spacing, and \coloneqq (from mathtools), as in := the colon is not centred on the maths axis.

\documentclass{article} \usepackage{mathtools,amsthm,amssymb,amsfonts} \usepackage{tikz} \usepackage{tikz-cd} \usetikzlibrary{arrows} \usepackage[showframe]{geometry} \begin{document} \begin{tikzcd}[row sep = 0ex] τ: I \arrow[rightarrow]{r} & \mathbb{R} \phantom{---------} \\ \phantom{τ:. } t \arrow[mapsto]{r} & τ(t) := \displaystyle ∫_{t₀}^{t} √{T · T} \ \mathrm{d} s \end{tikzcd} \begin{align*} τ\colon I & ―――→ \mathbb{R} & τ\colon I & \xrightarrow{\qquad} \mathbb{R} \\[-1ex] t & \longmapsto τ(t) ∶= ∫_{t₀}^{t} √{T · T} \, \mathrm{d} s & t & \xmapsto{\qquad} τ(t) ∶= ∫_{t₀}^{t} √{T · T} \, \mathrm{d} s \end{align*} \end{document}

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