{ "id": "1410.7205", "version": "v1", "published": "2014-10-05T02:59:56.000Z", "updated": "2014-10-05T02:59:56.000Z", "title": "Strong convergence of two-dimensional Walsh-Fourier series", "authors": [ "George Tephnadze" ], "comment": "Walsh system, Strong convergence, martingale Hardy space. arXiv admin note: text overlap with arXiv:1309.7548, arXiv:1310.8212 by other authors", "journal": "Ukrainian Mathematical Journal (UMJ), 65, N6, (2013), 822-834", "categories": [ "math.CA", "math.FA" ], "abstract": "We prove that certain mean of the quadratical partial sums of the two-dimensional Walsh-Fourier series are uniformly bounded operators from the Hardy space $H_{p}$ to the space $L_{p}$ for $0