For someone who's bored with wave mechanics, would you suggest studying Heisenberg's matrix mechanics (which was the first formulation)? Are there any major/conceptual differences? (except one talks about waves and the other doesn't!) And for someone who wants to study it, what books/online docs would you suggest? Damn, all QM I have ever found covers wave-mechanics majorly, and some briefly mention matrix mechanics when the title hits angular momentum.