In this paper, a new theorem on degree of approximation of a function f ∈ W (L(subscript r), ξ(t)) class by (C, 1) (E, q) product summability means of Fourier series has been proved.
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Chang, C. S. (2012). 以硝酸氧化金屬鉿技術製備氧化鉿/二氧化矽堆疊結構之介電層的穩定度分析 [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU.2012.03120
THAHEEM, A. B. (1986). ON THE OPERATOR EQUATION α+α(-1)=β+β^(-1). International Journal of Mathematics and Mathematical Sciences, 1986(), 767-770. https://doi.org/10.1155/S0161171286000923