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Could someone please let me know how to include the s-with-a-hat character (\^{s}) within a square root. I hoped $\sqrt{ \^{s} }$ would do the job.

Mico
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James Bejon
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2 Answers2

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Probably you are looking for the \hat command.

\documentclass{article}

\begin{document}
$\sqrt{\hat{s}}$
\end{document}

enter image description here

karlkoeller
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  • That looks great, thanks. Only there are all sorts of other symbols I'd like to use within the square root sign, such as those listed here: (http://en.wikibooks.org/wiki/LaTeX/Special_Characters#Escaped_codes). Do I have to find math mode equivalents of them all? – James Bejon Jan 03 '15 at 13:44
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    @JamesBejon Yes, you should look the math versions of these up, see http://tex.stackexchange.com/q/14/15925 . The math versions work too when there are multiple accents on the same symbol. – Andrew Swann Jan 03 '15 at 14:41
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Building on @karlkoeller 's answer - you can use \text and \emph in math mode. This may not get the italicized variable names quite right. Clearly needs work for accents below the letter.

enter image description here

\documentclass{article}

\usepackage{amsmath}

\begin{document}
$\sqrt{\hat{s}}$ $\sqrt{\text{\emph{\"s}}}$ 
$\sqrt{\text{\emph{\v{s}}}}$ $\sqrt{\text{\emph{\c{s}}}}$
\end{document}
Ethan Bolker
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    I'd prefer $\sqrt{\ddot{s}}$ to $\sqrt{\text{\emph{\"s}}}$, at least for situations that involve the second derivative with respect to time... The placement of the cedilla below the italic-s is much improved by loading either the lmodern package or the fontenc package with option T1, by the way. – Mico Jan 03 '15 at 14:18
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    Sorry, but this is wrong. It could be only for the cedilla, but for hat, double dot and check accents, one should use \hat{s}, \ddot{s} and \check{s}. Note also that $\sqrt{\text{\emph{\"s}}}$ would result in an upright s when in the statement of a theorem or anywhere italics is used. – egreg Jan 03 '15 at 14:41
  • @egreg I knew (and said) the \emph was a hack. Without knowing the OP's use cases I don't know whether that's a problem. – Ethan Bolker Jan 03 '15 at 15:31