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based on an earlier version of the Wolfram Language.
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RadicalBox

RadicalBox[x, n]
is a low-level box construct that represents the displayed object in notebook expressions.
  • Inside \(...\) RadicalBox[x, n] can be input as \@x\%n.
  • In a notebook a RadicalBox can be created using Ctrl+@ or Ctrl+2, then using Ctrl+% to move to the index position. Ctrl+Space moves out of the radical.
  • The baseline of RadicalBox[x, n] is taken to be the baseline of x.
  • If RadicalBox[x, n] does not fit on a single line, it is output as x^(1/n).
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