On second thought, it looks what the binomial theorem could be extended such that k (in the paper this is n) goes to infinity, though for values of k greater th

On second thought, it looks what the binomial theorem could be extended such that k (in the paper this is n) goes to infinity, though for values of k greater than n the value is zero. I'm more intuitive than mathematical. The thing feels like taking a taylor series of a square wave.