Resumen de Approximation problems in modular spaces of double sequences

Aleksander Waszak

• 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 (...).