Surd[x, n]
gives real-valued the ^(th) root of x.


  • Surd[x, n] returns the real-valued ^(th) root of real-valued x for odd n.
  • Surd[x, n] returns the principal ^(th) root for non-negative real-valued x and even n.
  • For symbolic x in Surd[x, n], x is assumed to be real valued.
  • Surd can be evaluated to arbitrary numerical precision.
  • Surd automatically threads over lists.
  • In StandardForm, Surd[x, n] formats as .
  • can be entered as EscsurdEsc, and Ctrl+% moves between the fields.
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