When I last reviewed the writeup for the series operators, I noticed two issues:
First, why is the RHS argument a list? You only ever use the first element of it; so why don't you just reference a single value? Second, I'm trying to think of a simple and intuitive way to write up a series expression for: triangle numbers: 0, 1, 3, 6, 10, 15, 21, etc. square numbers: 0, 1, 4, 9, 16, 25, 36, etc. factorials: 1, 1, 2, 6, 24, 120, 720, 5040, etc. The difficulty that I'm running into is that there's no reasonably straightforward way of computing a given term solely from the previous one or two items in the list. There _is_ a simple way to compute the next item from the previous item and the index number, or even strictly from the index number; but there is no way that I'm aware of to get the index number into the step function. -- Jonathan "Dataweaver" Lang
