k'' is better than k_prime_prime, sure. But there's still lots of notation that isn't just a sequence of characters. And Latex-style representations are restric

k'' is better than k_prime_prime, sure. But there's still lots of notation that isn't just a sequence of characters. And Latex-style representations are restricted to sequences of characters. A big formula in Latex code is hard to read compared to the rendered version. LyX would be a nicer representation.