How can I put an arc symbol above a letter?

Hello.

I need to put an arc above a letter (or some letters). Adding a bar or a had is simple, i.e.,

\bar{a}

or

\hat{a}

but

\arc{a}

or

\overarc{ab}

is not supported. Is this possible in matlab to add an arc symbol using Latex notation?

Answer 1

[Walter Roberson]

$\widehat{ab}$

gives something arc-ish

$\stackrel{\frown}{ab}$

gives an arc, if not the prettest of them. Or

$\frown \atop ab$