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Nice-looking p-th roots

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




the result of the document is

root 1/3 is typeset to low




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 – user2478 Aug 27 '12 at 13:35

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