Approximation problems in modular spaces of double sequences

Autores: Aleksander Waszak
Localización: Publicacions matematiques, ISSN 0214-1493, Vol. 34, Nº 2, 1990, págs. 259-268
Idioma: inglés
DOI: 10.5565/publmat_34290_04
Títulos paralelos:
- Problemas de aproximación en espacios modulares de sucesiones dobles
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Resumen
- Let X denote the space of all real, bounded double sequences, and let F, f, G be f-functions. Moreover, let ? be an increasing, continuous function for u = 0 such that ?(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 (...).