History of Mathematical Notation
stephenwolfram.com
stephenwolfram.com
http://www.stephenwolfram.com/publications/talks/mathml/math...
(Just to hopefully be helpful. It took me a minute myself to notice the "previous" link at the bottom. Thanks for the article.)
I really think it picks up near the middle though, so that's the part I want to point to. Thanks for taking the time to point this out, though.