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8 p, 192.1 KB Approximation problems in modular spaces of double sequences / Waszak, Aleksander
Let X denote the space of all real, bounded double sequences, and let Ф∞,Γ, be, ∞-functions . Moreover, let Ψ be an increasing, continuous function for u ≥ 0 such that Ψ (0) = 0. In this paper we consider some spaces of double sequences provided with two-modular structure given by generalized variations and the translation operator. [...]
1990 - 10.5565/PUBLMAT_34290_04
Publicacions matemàtiques, V. 34 n. 2 (1990) p. 259-267  

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