Summary
The authors have defined the product of two summability methods and have applied it to Fourier series. The criterion are analogous to the known criterion Convergence of Fourier series.
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Sharma, P.L., Rao, V.V.G. On the harmonic summability of Fourier series. Annali di Matematica 74, 203–226 (1966). https://doi.org/10.1007/BF02416457
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DOI: https://doi.org/10.1007/BF02416457