MathSciNet bibliographic data MR1198461 (94i:42003) 42A10 (42A20 42A32) Zhou, S. P. What strong monotonicity condition on Fourier coefficients can make the ratio \$\Vert f-S\sb n(f)\Vert /E\sb n(f)\$$\Vert f-S\sb n(f)\Vert /E\sb n(f)$ be bounded? Proc. Amer. Math. Soc. 121 (1994), no. 3, 779–785. Article

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