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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

6
\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

| improve this answer | |
  • 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 – user2478 Aug 27 '12 at 13:35

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