[andyfox]

I don't think that what Mason said underrepresents Ed's contribution. It might misrepresent it, but it doesn't do any good to have an idea if it you can't explain it well. So even if that was all Ed contributed--and I too, based on discussion with Ed and others, don't think that's accurate--it is a major contribution. I have the highest respect for David, but he is a poor writer.