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This question already has an answer here:

I need something like $\curvearrowright$, but pointing in both directions. This is for a commutative diagram. Thank you!

marked as duplicate by Adam Liter, Sean Allred, Jesse, ChrisS, Svend Tveskæg Mar 9 '14 at 8:11

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  • 1
    Welcome to the site! How about \curvearrowleftright from mathabx? – cmhughes Mar 9 '14 at 3:57
  • @cmhughes Thanks, the only problem with that one is it does not curve quite enough. Instead, I just learned to use mathrlap in mathtools, then overlayed the left and right curved arrows. I had to mess with the spacing to get them to align. – Forever Mozart Mar 9 '14 at 4:30
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Here are two variants: One stolen from Heiko from his answer

\documentclass{article}
\usepackage{mathtools,amssymb,graphicx}
\newcommand{\myarrow}{\scalebox{1.2}[2]{$\mathclap{\curvearrowleft}\mkern2.2mu
                                                 \mathclap{\curvearrowright}$}}

% from package mathabx:
\DeclareFontFamily{U}{mathb}{\hyphenchar\font45}
\DeclareFontShape{U}{mathb}{m}{n}{
      <5> <6> <7> <8> <9> <10> gen * mathb
      <10.95> mathb10 <12> <14.4> <17.28> <20.74> <24.88> mathb12
      }{}
\DeclareSymbolFont{mathb}{U}{mathb}{m}{n}
\DeclareFontSubstitution{U}{mathb}{m}{n}
\DeclareMathSymbol{\downtouparrow}{3}{mathb}{"FF}

\newcommand*{\Myarrow}{%
  \scalebox{1}[-2]{$\mathclap{\downtouparrow}\mkern0.5mu
                                                 \mathclap{\reflectbox{$\downtouparrow$}}$}
}
\begin{document}
\[
 \myarrow 
\]

\[
\Myarrow
\]

\end{document}

enter image description here

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