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J. K. Kushwaha,Laxmi Rathour,Vishnu Narayan Mishra,Krishna Kumar 원광대학교 기초자연과학연구소 2022 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.24 No.3
A number of researchers (See [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]) have determined the degree of approximation of functions belonging to Lipschitz classes, using Cesaro, Euler and generalized Nörlund and various product summability means. Recently Krasniqi [15] has determined the degree of approximation of conjugate of functions using (E,q)(C, α, β) means. Mishra and Khatri [7] also determined the degree of approximation by using (Np.E1) product means in the Hölder metric. In this paper, we have determined the degree of approximation of functions belonging to Lipschitz class and weighted class by using (N, p)(C, θ, β) means of Fourier series and conjugate series of Fourier series which in particular becomes (E, q)(C, θ, β).