This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)

UnderscriptBox

UnderscriptBox
is the low-level box representation for in notebook expressions.
  • In a notebook, an UnderscriptBox can be created using Ctrl+4 or Ctrl+$. Ctrl+Space moves out of the underscript position.
  • 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.
Display a letter with an underscript:
An UnderscriptBox form is typically interpreted as an Underscript expression:
The standard formatting for Underscript uses UnderscriptBox:
The formatted result looks like this:
Display a letter with an underscript:
In[1]:=
Click for copyable input
Out[1]//DisplayForm=
 
An UnderscriptBox form is typically interpreted as an Underscript expression:
In[1]:=
Click for copyable input
Out[1]=
In[2]:=
Click for copyable input
Out[2]//FullForm=
 
The standard formatting for Underscript uses UnderscriptBox:
In[1]:=
Click for copyable input
Out[1]//FullForm=
The formatted result looks like this:
In[2]:=
Click for copyable input
Out[2]=
New in 3 | Last modified in 6