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| Some Problems on Trigonometric Approximation | |
| 作者姓名： | 周颂平 |
| 作者单位： | Hangzhou University |
| 摘 要： | Let C_(2π) be the class of continuous functions with period 2π,C_(2π×2π)be theclass of continuous functions of double variables,2π-periodic in each variableE_n(f),S_n(f,x),ε_n(f,x)are the n-th best approximation,n-th partial sum ofFourier series and n-th Euler means of f(x)∈C_(2π)respectively.For given moduluof continuity ω(δ), |
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