The Dual Space χ 2 of Double Sequences
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1 Article International Journal of Modern Mathematical Sciences, 2013, 7(3): International Journal of Modern Mathematical Sciences Journal homepage: The Dual Space χ 2 of Double Sequences N.Subramanian 1, * and U.K.Misra 2 1 Department of Mathematics, SASTRA University, Thanjavur , India 2 Department of Mathematics, Berhampur University, Berhampur ,Odissa, India ISSN: X Florida, USA * Author to whom correspondence should be addressed; nsmaths@yahoo.com; umakanta misra@yahoo.com Article history: Received 22 March 2013, Received in revised form 4 July 2013, Accepted 10 July 2013, Published 17 July Abstract: We determined the β(v)- dual of the space and established that the α- and β- duals of the space χ 2 not coincide with the β(v)- dual; where v. Keywords: double gai sequences, double analytic, double gai, dual 2000 Mathematics subject classification: 40A05, 40C05, 40D Introduction Throughout ω, χ and denote the classes of all, gai and analytic scalar valued single sequences, respectively. We write ω 2 for the set of all complex sequences (x mn ); where m,n ; theset of positive integers. Then, ω 2 is a linear space under the coordinate wise addition and scalar multiplication. Some initial works on double sequence spaces is found in Bromwich [4].Later on, they were investigated by Hardy [8], Moricz [12], Moricz andrhoades [13], Basarir and Solankan [2], Tripathy [20], Colak and Turkmenoglu[6], Turkmenoglu [22], and many others. Let us define the following sets of double sequences:
2 263
3 264
4 265
5 The Double Sequences Space χ 2
6 Lemma [50, Theorem 2, p.279] A positive term double series converges to its l.u.b(that is the l.u.b of its partial sums) if it is bounded above. Otherwise itdiverges to Lemma [49, p.382] A double series is absolutely convergent if and only if the set is a bounded set of all real numbers. 5. Main Results 5.1. Proposition χ 2 is solid
7 Theorem 5.3. Theorem
8 Theorem
9 Theorem 5.6. Theorem
10 271
11 272 References [1] T. Apostol, Mathematical Analysis, Addison-wesley, London, [2] M. Basarir and O. Solancan, On some double sequence spaces, J. Indian Acad. Math., 21(2) (1999): [3] C. Bektas and Y. Altin, The sequence space l M (p, q, s) on semi normed spaces, Indian J. Pure Appl. Math.,34(4)(2003): [4] T.J.I'A. Bromwich, An introduction to the theory of infinite series, Macmillan and Co. Ltd., New York, [5] J.C. Burkill and H. Burkill, A Second Course in Mathematical Analysis, Cambridge University Press, Cambridge, New York, [6] N. Subramanian and U.K. Misra, The Riesz aspects of sequence spaces, Kragujevac Journal of Mathematics, 36(2) (2012): [7] M. Gupta and P.K. Kamthan, Infinite matrices and tensorial transformations, Acta Math., 5(1980): [8] G.H. Hardy, On the convergence of certain multiple series, Proc. Camb. Phil. Soc., 19(1917): [9] M.A. Krasnoselskii and Y.B. Rutickii, Convex functions and Orlicz spaces, Gorningen, Netherlands, [10] J. Lindenstrauss and L. Tzafriri, On Orlicz sequence spaces, Israel J. Math., 10(1971): [11] I.J. Maddox, Sequence spaces defined by a modulus, Math. Proc. Cambridge Philos. Soc, 100(1) (1986): [12] F. Moricz, Extentions of the spaces c and c 0 from single to double sequences, Acta. Math. Hung., 57(1-2) (1991): [13] F. Moricz and B.E. Rhoades, Almost convergence of double sequences and strong regularity of summability matrices, Math. Proc. Camb. Phil. Soc., 104(1988):
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