Typing Underscripts

Typing (UnderBar[x])

Type the expression that will have an underscript.

Type x:

x\[VerticalSeparator]

Create an underscript by pressing the Control key and the 4 key at the same time.

Press Ctrl+4 or Ctrl+$:

(Underscript[x, \[Placeholder]])

Type an underscore into the placeholder (which is already selected).

Type _:

(Underscript[x, _\[VerticalSeparator]])

Move the insertion point out of the underscript position up to the baseline by pressing the Control key and the Space bar at the same time.

Press Ctrl+Space:

(UnderBar[x])\[VerticalSeparator]

Typing (UnderBar[x+y])

Press the Control key and the 4 key at the same time.

This creates a pair of placeholders, one on the baseline and another in the underscript position.

Press Ctrl+4 or Ctrl+$:

(Underscript[\[SelectionPlaceholder], \[Placeholder]])

Type the expression into the placeholder (which is already selected).

Type x+y:

(Underscript[x+y, \[Placeholder]])

Press the Tab key to select the placeholder that is under the baseline.

Press Tab:

(Underscript[x+y, \[SelectionPlaceholder]])

Type an underscore.

Type _:

(Underscript[x+y, _\[VerticalSeparator]])

Press the Control key and the Space bar at the same time to get out of the underscripted expression.

Press Ctrl+Space:

(UnderBar[x+y])\[VerticalSeparator]

Typing (lim_(x->a))f[x]

Type lim, and press Ctrl+4:

(lim_\[Placeholder])

Type x:

(lim_(x\[VerticalSeparator]))

Press Esc, type ->, and press Esc:

(lim_(x->\[VerticalSeparator]))

Type a, and press Ctrl+Space:

(lim_(x->a))\[VerticalSeparator]

Type f[x]:

(lim_(x->a))f[x]\[VerticalSeparator]