Sarıgöl, Mehmet Ali; Bor, Hüseyin
(1995)
By (A, B) we denote the set of all sequences ? = (?n) such that ?an?n is summable B, whenever ?an is summable A, where A and B are summability methods. In the present paper we characterize the sets (|N¯, pn|, |N¯, qn|k) ...