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Property of Approximation of Abstract Two Level Bounded Variation Functions

Ye Zhongqiu  
In this paper, the property of approximation of abstract periodic two level bounded variation functions is discussed, and Beinstein inequality of trigonometric polynomial with abstract coefficient is obtained. Finally the following is obtained: the order of approximation for x(t)∈v_(2π)~(2) by the poly normals and the sufficient and necessary condition of x(t)∈v_(2π)~(2)
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