Have you tried the Subscript
and Superscript
functions? There's also the Basic Math Assistant under the Palettes menu item so one can point and click one's way to special formatting.
But you'll find that making equations "pretty" don't always work like you think they should. You might be better off using constructs like x[1]
, x[2]
, etc. (not to be confused with "Part" which uses double square brackets: [[...]]).