tailieunhanh - Báo cáo hóa học: "A CLASS OF CONSERVATIVE FOUR-DIMENSIONAL MATRICES"

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: A CLASS OF CONSERVATIVE FOUR-DIMENSIONAL MATRICES | A CLASS OF CONSERVATIVE FOUR-DIMENSIONAL MATRICES CELAL CAKAN AND BILAL ALTAY Received 5 October 2005 Accepted 2 July 2006 The concepts P - lim sup and P - lim inf for double sequences were introduced by Patterson in 1999. In this paper we have studied some new inequalities related to these concepts by using the RH-conservative four-dimensional matrices. Copyright 2006 C. Cakan and B. Altay. 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. 1. Introduction A double sequence x xjk k 0 is said to be convergent to a number l in the Pringsheim sense or P-convergent if for every e 0 there exists N e N the set of natural numbers such that xjk - l e whenever j k N 5 . In this case we write P - limx l. In what follows we will write xjk in place of xjk jk 0. A double sequence x is said to be bounded if there exists a positive number M such that xjk M for all j k that is if l x sup I xjk I TO. j k Let f2 be the space of all real bounded double sequences. We should note that in contrast to the case for single sequences a convergent double sequence need not be bounded. By c we mean the space of all P-convergent and bounded double sequences. Let A a kn k 0 be a four-dimensional infinite matrix of real numbers for all m n 0 1 . The sums 00 00 ymn z s afxjk are called the A-transforms of the double sequence x. We say that a sequence x is A-summable to the limit s if the A-transform of x exists forall m n 0 1 . and convergent Hindawi Publishing Corporation Journal ofInequalities and Applications Volume 2006 Article ID 14721 Pages 1-8 DOI JIA 2006 14721 2 A class of conservative four-dimensional matrices in the Pringsheim sense that is p q lim z z amnxjk ymn l j j lim ymn s. m n - A matrix A amkn is said to be RH-regular see 1 6 if Ax e c- and P - limAx P - limx for each x e c-. If a matrix A is .

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