Maximal operators of Fejér means of double Vilenkin-Fourier series
István Blahota, György Gát, Ushangi Goginava (2007)
Colloquium Mathematicae
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The main aim of this paper is to prove that the maximal operator of the Fejér means of the double Vilenkin-Fourier series is not bounded from the Hardy space to the space weak-.