Problem with superscript and subscript in mathematica

[yashar]

hi

i want to sum over two indices i and j . the elemet that i must sum is (x^(i,j))-i
that is x has superscript i,j and subscript i.
but in mathematica it gives me error.
here is the notebook :
http://www.mediafire.com/?novtz7t0liu9u78

thanks (:

 

[Bill Simpson]

I believe if you stop trying to desktop publish the format and just try to calculate the answer that you will have results with much less frustration.

I realize textbooks use sub and super scripts and you find words like sub and super script in the Mathematica help. But again and again new users find they cannot figure out how to make this work.