trigonometric polynomial approximation
trigonometric polynomial approximation
三角多项式近似
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Using the modulus of smoothness and K-functional, direct and inverse theorems of simultaneous approximation for a kind of multivariate trigonometric polynomial operators are established.
利用光滑模和K -泛函给出了一类多元三角多项式算子同时逼近的正逆定理。
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