Martingale Hardy Spaces and Summability of One-Dimensional Vilenkin-Fourier Series

• - 1. Partial Sums of Vilenkin-Fourier Series in Lebesgue Spaces. - 2. Martingales and Almost Everywhere Convergence of Partial Sums of Vilenkin-Fourier Series. - 3. Vilenkin-Fejér Means and an Approximate Identityin Lebesgue Spaces. - 4. Nörlund and T Means of Vilenkin-Fourier Series in Lebesgue Spaces. - 5. Theory of Martingale Hardy Spaces. - 6. Vilenkin-Fourier Coefficients and Partial Sums in Martingale Hardy Spaces. - 7. Vilenkin-Fejér Means in Martingale Hardy Spaces. - 8. Nörlund and T Means of Vilenkin-Fourier Series in Martingale Hardy Spaces. - 9. Convergence of Vilenkin-Fourier Series in Variable Martingale Hardy Spaces. - 10. Appendix: Dyadic Group and Walsh and Kaczmarz Systems.

“The book offers a wonderful overview, very well structured and complete, on the theory of harmonic analysis developed in the context of the Vilenkin-Fourier series. … each chapter begins with a broad introduction rich in bibliographical citations that allow the reader to locate himself in the historical context of the topics to be addressed … the authors include an important and interesting list of open problems proposed with a view to being resolved in future research.” (Iris Athamaica López Palacios, zbMATH 1512.42042, 2023)