... 三角巾 sling; 三角近似法 trigonometric approximation; 三角晶系 trigonal system; ...
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trigonometric approximation polynomial 三角近似多项式
trigonometric polynomial approximation 三角逼近
approximation by trigonometric polynomials 三角多项式逼近
trigonometric polynomials of best approximation 最佳逼近三角多项式
approximation by trigonometric interpolating polynomials 三角插值多项式逼近
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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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