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For years, I've been using a hobbled together command to get the arc notation as used in the textbooks adopted by high schools in my area. I'm not really all that pleased with the result: it's just barely tolerable. I figured someone in the community here might have a better solution to what I've been getting by with for several years.

\documentclass{article}
\usepackage{amsmath,amssymb}
%% my poor man's solution to arc notation
\newcommand{\tarc}{\mbox{\large$\frown$}}
\newcommand{\arc}[1]{\stackrel{\tarc}{#1}}
%%
\pagestyle{empty}
\begin{document}

\begin{align*}
    \arc{AC} \\
    \arc{BAD}\\
    \arc{ICK}
\end{align*}


\end{document}

enter image description here

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Check texdoc symbols-a4 for \wide and especially \wideparen. –  Qrrbrbirlbel Feb 4 '13 at 3:13
2  
Did you see the related question frown and mathop/stackrel/overset? You can use \widearc with the kpfonts or fourier packages, but these change your fonts. \wideparen from yhmath or a few other packages, mentioned there, also works. –  Kundor Feb 4 '13 at 3:16

1 Answer 1

up vote 8 down vote accepted

tipa's \texttoptiebar looks useable:

enter image description here

\documentclass{article}
\usepackage{graphicx,tipa}% http://ctan.org/pkg/{graphicx,tipa}
\newcommand{\arc}[1]{%
  \setbox9=\hbox{#1}%
  \ooalign{\resizebox{\wd9}{\height}{\texttoptiebar{\phantom{A}}}\cr#1}}
\begin{document}
\arc{AC}\ \arc{BAD}\ \arc{ICK}\ \arc{GOOD}
\end{document}
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