Comment by ABCLAW

Better question: What background is the reader expected to have?

Until Xi, not a single variable is defined prior to inclusion into an expression. Even Alpha and Beta are only defined in the header diagram rather than the body of the text. Also, why are the iteration notations in the superscript rather than subscript?

And before someone chimes in and says that rudiments are necessary to understand this work, no they aren't. The logical steps here are exceptionally simple (and intuitive - as the introduction might lead you to believe) once you get past the delivery. This is a fantastic article that could become very accessible with the proper notation housekeeping.