Let X denote the space of all real, bounded double sequences, and let Φ, φ, Γ be φ-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 (...).
@article{urn:eudml:doc:41131,
title = {Approximation problems in modular spaces of double sequences.},
journal = {Publicacions Matem\`atiques},
volume = {34},
year = {1990},
pages = {259-268},
zbl = {0755.46004},
language = {en},
url = {http://dml.mathdoc.fr/item/urn:eudml:doc:41131}
}
Waszak, Aleksander. Approximation problems in modular spaces of double sequences.. Publicacions Matemàtiques, Tome 34 (1990) pp. 259-268. http://gdmltest.u-ga.fr/item/urn:eudml:doc:41131/