How to type
Type the expression that will have an overscript.
Create an overscript by pressing the Control key and the 7 key ( or the & key) at the same time.
Press 7ï® or &
Type an underscore into the placeholder (which is already selected).
Move the insertion point out of the overscript position down to the baseline by pressing the Control and Space keys at the same time.
How to type
Press the Control key and the 7 key (or the & key) at the same time. This creates a pair of placeholders, one on the baseline and another in the overscript position.
Press 7 or &
Type an underscore into the placeholder in the overscript (which is already selected).
Press the Tab key to select the placeholder that is on the baseline.
Type the expression under the overscript.
Press Control-Space to get out of the overscripted expression.
Another way to type
Select the expression. (You can select by dragging, by pressing Control-Dot repeatedly, or by clicking the expression repeatedly.)
Press the Control and & keys together to create a placeholder in the overscript position.
Type an underscore in the overscript position.
Press the Control-Space to get down to the baseline.