[Tex/LaTex] How to produce symbol with arrow under

amsmathsymbols

My goal is to create a symbol with an arrow and a variable length argument under it.

The top line in the picture shows how I want the symbol to look, generated using \underset{\quad \ \rightarrow k+1}{r}, however the spacing I have to introduce to the underset creates an unwanted space between this and A. Additionally, this spacing must be tuned to match the length of the variable length argument.

The second option uses \underrightarrow{r}_{k+1}, which removes the unwanted space, but uses an uglier arrow and places the subscript too high.

Can anyone think of a more elegant solution for me?

Best Answer

\documentclass[a4paper, 11pt]{article}
\usepackage{amsmath}


\begin{document}

   text

\fbox{$A\underset{\overset{\rightarrow}{}}{r}_{\overset{k+1}{}}$}

\fbox{$A\underset{\rightarrow}{r}_{k+1}$}


text
\end{document}

Related Solutions

[Tex/LaTex] Text over/under implies arrow

You can use \xRightarrow[below]{above} from the mathtools (or extpfeil) package or \xLongrightarrow[below]{above} from extarrows. (Have a look at “How to look up a math symbol?” for ideas how you can easily find a particular symbol.)

If you want to keep the the same arrow length as implies, you can use \underset and \overset from amsmath, e.g. \underset{below}{\implies}, or maybe \underset{\mathclap{below}}{\implies} (\mathclap makes it so that “below” doesn’t introduce extra vertical space if it is longer than the arrow. It is included in the immensely useful mathtools package).

[Tex/LaTex] How to create an Arrow Symbol

Using TikZ you can define a command that will give you a stretchable symbol; you can do something like this:

\documentclass{book}
\usepackage{tikz}

\newcommand\myarrow[1][1]{%
  \raisebox{-0.5cm}{\begin{tikzpicture}\draw (0,0) -- (#1,0); \draw[->] (#1,0) -- (#1,-0.5);\end{tikzpicture}}}

\begin{document}
\noindent\myarrow[6.4]
\begin{equation}
  x^n + y^n = z^n.
\end{equation}

\noindent\myarrow[4.8]
\begin{equation}
  a= b + c + d + e + f.
\end{equation}

\end{document}

enter image description here

Best Answer

Related Solutions

[Tex/LaTex] Text over/under implies arrow

[Tex/LaTex] How to create an Arrow Symbol

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