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Abstract
In continuation of a recent work by Mittal [M.L. Mittal, On strong Nörlund summability of Fourier series, J. Math. Anal. Appl. 314 (2006),75–84], the present authors obtain a sufficient condition for the summability [ N , p n ( 1 ) , 2 ] of the conjugate Fourier series. In conjunction with the known Tauberian theorem on the strong Nörlund summability, which was also considered earlier by Mittal [M.L. Mittal, A Tauberian theorem on strong Nörlund summability, J. Indian Math. Soc. (N.S.) 44 (1980), 369–377], our result gives a sufficient condition for the summability [ C, 1 , 2] of the conjugate Fourier series. Our main theorem generalizes the results given earlier by Prasad [G. Prasad, On Nörlund Summability of Fourier Series, Ph.D. thesis, University of Roorkee, Roorkee, 1967] and Singh [U.N. Singh, On the strong summability of a Fourier series and its conjugate series, Proc. Nat. Inst. Sci. India Part A 13 (1947), 319–325].
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