This is the paper "Five six and seven-term Karatsuba Like Formulae.pdf" by P L Montgomery
Has anybody read or is reading this paper? I would like to discuss some aspects of it. For starters, I need to know what has been done in Sec. 2.3 on page 3, specifically the line that says
(Xa0(X) + a1(X))*(Xb0(X) + b1(X))
What does this mean and how does it come?
If anybody has any idea about this method let's discuss about this. Your help will be greatly appreciated.