Some theorems on strong regularity of Nörlund methods
Brian Kuttner · Mathematical Proceedings of the Cambridge Philosophical Society · 1974
1. Given a series we will throughout write {sn} for the sequence of its partial sums; that is to say, We will write p, q to denote the sequences {pn}, {qn}; we will write throughout and will take P−1 = p−1 = 0.