tailieunhanh - Báo cáo hóa học: " Research Article Notes on |N, p, q|k Summability Factors of Infinite Series"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Notes on |N, p, q|k Summability Factors of Infinite Series | Hindawi Publishing Corporation Journal of Inequalities and Applications Volume 2011 Article ID 365453 8 pages doi 2011 365453 Research Article Notes on N p q k Summability Factors of Infinite Series W. T. Sulaiman Department of Computer Engineering College of Engineering University of Mosul Mosul Iraq Correspondence should be addressed to W. T. Sulaiman waadsulaiman@ Received 5 November 2010 Accepted 19 January 2011 Academic Editor Paolo E. Ricci Copyright 2011 W. T. Sulaiman. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. New result concerning N p q k summability of the infinite series y OnXn is presented. 1. Introduction Let y an be a given infinite series with sequence of partial sums sn . Let Tn denote the sequence of N p q means of sn . The N p q transform of sn is defined by 1 n Tn pn-vqvsv where n Rn y pn-vqv 0 for any n p-1 q-1 R-1 0 . Necessary and sufficient conditions for the N p q method to be regular are i limn - pn-vqn Rn 0 for each v ii yn 0 pn-vqv K Rn where K is a positive constant independent of n. 2 Journal of Inequalities and Applications The series y an is said to be summable K pn k k 1 if y nk 1 n - Vn-1 k TO n 1 where 1n Vn p y PvSv C1-4 where Pn p1 p2 pn TO as n TO. The series y an is said to be summable N pn if TO ypn - ơn-1 TO n 1 where 1n ơn P y pn-vSv and it is said to be summable N p q k k 1 if TO ynk-1 Tn - Tn-1 k TO n 1 where Tn is as defined by . For k 1 N p q k summability reduces to N p q summability. The series y an is said to be N p q bounded or y an O 1 N p q if n in j pn-vqvsv O Rn as n ỳ TO- By M we denote the set of sequences p pn satisfying pn 1 pn 2 1 pn 0 n 0 1 . . . pn pn 1 It is known Das 1 that for p e M holds if and only if TO n 1 npn n pn-vvav v 1 TO. 3 Journal of Inequalities and .

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