My question has to do with symbol function with the Equation Editor. Recently I tried to recreate a formula that included the summation symbol (sigma sign). It copied sign just fine, but it does not allow me to add indexes or limits - which would give me blue shaded boxes the same way as fractions, root signs, subscripts and superscripts - - these work fine. The sigma sign is missing this function so formulas with it are incomplete.
Any suggestions? Thanks!