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On the Zweier sequence space

Sengonul M.

Demonstratio Mathematica

2007

Vol. 40, nr 1

181-196

The purpose of this paper is to introduce the Zweier sequence spaces Ż and Ż0 consisting of all sequences x = (xk) such that (Zx) in the space c and c0 respectively, which is normed. Also, prove that Ż and Ż0 are linearly isomorphic to the space c and c0 respectively. Additionally, the alpha, beta and gamma -duals of the spaces Ż and Ż0 have been computed and space of Ż0 Schauder base have been constructed. Furthermore, given the two theorem concerning matrix map. Finally, the norm of Zweier operator have been given and the .ne spectrum of the Zweier operator over the sequence spaces c and c0 has been determined.

Infinite matrices and sigma(A)-core

Kayaduman K., Furkan H.

Demonstratio Mathematica

2006

Vol. 39, nr 3

531-538

In [8], the concepts of sigma-core of a bounded number sequence x have been introduced and also some inequalities which are analogues of Knopp's core theorem have been proved. In this paper, using the concept of Vsigma(A)-summabiIity introduced by Savas, we characterize the matrices of the class (Vmu, Vsigma(A))reg and determine necessary and sufficient conditions for a matrix B to satisfy qsigma(A) (Bx) C qmu(x) for all x is an element of m.

Some new sequence spaces which include the spaces lp and l infinity

Aydin C., Başar F.

Demonstratio Mathematica

2005

Vol. 38, nr 3

641--656

In the present paper, we introduce the sequence space apr of non-absolute type and prove that the spaces apr and lp are linearly isomorphic for 0 < p < oo. We also show that apr which includes the space Lp, is a p-normed space and a BK space in the cases of 0 < p < 1 and 1 < p < oo, respectively. Furthermore, we give some inclusion relations and determine the alfa-, beta- and gamma-duals of the space Op and construct its basis. We devote the last section of the paper to the characterization of the matrix mappings from the space arp to some of the known sequence spaces and to some new sequence spaces.