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UnderscriptBox

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UnderscriptBox[x, y]
is the low-level box representation for

in notebook expressions.

MORE INFORMATION

UnderscriptBox is the low-level representation of Underscript. Except for low-level notebook expression manipulation, UnderscriptBox should not need to be used directly.

Inside \(...\) UnderscriptBox[x, y] can be input as x\+y.

In a notebook, an UnderscriptBox can be created using Ctrl++. Ctrl+Space moves out of the underscript position.

In StandardForm, UnderscriptBox[x, y] is interpreted on input as Underscript[x, y].

UnderscriptBox[x, "_"] is interpreted as UnderBar[x] or . The input form x\&\%- can be used.

The baseline of UnderscriptBox[x, y] is taken to be the baseline of x.

UnderscriptBox[x, y] is usually output with y in a smaller font than x.

With the option setting LimitsPositioning->True, y is placed in an underscript position when the whole UnderscriptBox is displayed larger, and in a subscript position when it is displayed smaller.

In StandardForm, explicit UnderscriptBox objects are output literally. You can use DisplayForm to see the display form of such objects.

Basic Examples (3)

Display a letter with an underscript:

Out[1]//DisplayForm=

An UnderscriptBox form is typically interpreted as an Underscript expression:

Out[2]//FullForm=

The standard formatting for Underscript uses UnderscriptBox:

Out[1]//FullForm=

The formatted result looks like this:

Underscript OverscriptBox UnderoverscriptBox SubscriptBox GridBox ScriptSizeMultipliers

Representing Textual Forms by Boxes

String Representation of Boxes

Low-Level Notebook Structure

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