Documentation Publicon Reference Keyboard Shortcuts Entering 2D Expressions Examples
Subscripts
How to type
Type the symbol that will have the subscript.
Type x
Create a subscript by pressing the CONTROL key and the - key (or the _ key) at the same time.
Press - or _
Type the subscript into the placeholder (which is already selected).
Type i
Move the insertion point out of the subscript position up to the baseline by pressing the CONTROL and SPACE keys at the same time.
Press
See the example for to see how to avoid multiplying the two superscripts.
Type x, press _
Type i, press , type j
Similar to the previous example, but the subscripts are separated by an invisible space.
Type i, press 8, type j
The first three steps create and fill in the subscript and its subscript.
Type n, press _
Press the CONTROL key and the SPACE bar at the same time twice to move up to the baseline.
Press twice
or 
to see how to avoid multiplying the two superscripts. 
