... S¸ahiner, M. G¨urdal, S. Saltan, and H. Gunawan, “Ideal convergence in 2-normed spaces,” TaiwaneseJournal of Mathematics, vol. 11, no. 5, pp. 1477–1484, 2007.6 M. G¨urdal and S. Pehlivan, ... follows:Axm,n∞,∞k,l1,1 a m,n,k,lxk,l. 2.21Such transformation is said to be nonnegative if a m,n,k,lis nonnegative for all m, n, k, and l.2 Journal of Inequalities and ApplicationsIf convexity of Orlicz ... Spaces and Series,vol.65ofLectur e Notes in Pure and AppliedMmathematics, Marcel Dekker, New York, NY, USA, 1981.18 E. Savas and R. F. Patterson, “On some double sequence spaces defined by a...