RadicalBox

is a low-level box construct that represents the displayed object in notebook expressions.

Details and Options

Inside \(…\) RadicalBox[x,n] can be input as \@x\%n.
In a notebook a RadicalBox can be created using or , then using to move to the index position. moves out of the radical.
The following options can be given:

BaseStyle	{}	the style to use
ExponentPosition	{0.2,0.1}	where to place the radical exponent
MultilineFunction	Automatic	how to handle scripts so long that line-breaking may be necessary
SurdForm	False	whether the radical represents a Surd expression

In StandardForm and InputForm, RadicalBox[x,n] is by default interpreted on input as x^(1/n).
In StandardForm and InputForm, RadicalBox[x,n] is interpreted on input as Surd[x,n] if the option SurdFormTrue is set.
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).
In StandardForm, explicit RadicalBox objects are output literally. You can use DisplayForm to see the display form of such objects.

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Display a letter under a radical with a root index:

A RadicalBox form is typically interpreted as a fractional power:

The TraditionalForm formatting for an root uses RadicalBox:

The formatted result looks like this:

This radical box has the option SurdFormTrue set:

The presence of the option SurdForm ensures the boxes are interpreted in the same manner:

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