Emacs, but it's still hard to do. That code excerpt is nothing compared to what I have worked with in some code I no longer I have access to; some of the formu

Emacs, but it's still hard to do. That code excerpt is nothing compared to what I have worked with in some code I no longer I have access to; some of the formulas stretched on for about 6 lines of 80 chars each. It's not so much the unbalanced parens as it is about having the wrong thing in the denominator of a gigantic multilevel fraction.