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Possible Duplicate:
Nice-looking p-th roots

How can I move the root higher for this formula ? The fraction in the root is typeset to low:

\documentclass{minimal}
\begin{document}

$\sqrt[\frac{1}{3}]{\frac{4}{4.2}}$

\end{document}

the result of the document is

root 1/3 is typeset to low

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marked as duplicate by percusse, Thorsten, Jake, Gonzalo Medina, Harish Kumar Aug 27 '12 at 13:44

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1 Answer

up vote 2 down vote accepted
\documentclass{article}
\usepackage{amsmath}
\begin{document}

$\sqrt[\leftroot{-2}\uproot{5}\frac{1}{3}]{\frac{4}{4.2}}$

\end{document}

Unit for the macros is mu (mathunit 1mu=1/18em)

enter image description here

See also page 59 of mathmode document -> texdoc mathmode

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It is better. I have other question: how do the commands \leftroot and \uproot work? Is there any formula to calculate their arguments, depends on the fraction? –  lazyboy Aug 27 '12 at 13:27
1  
the insert only vertical and/or horizontal space which doesn't depend to the following argument –  Herbert Aug 27 '12 at 13:35
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