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K阶Sikkema-Kantorovitch算子L^p逼近的正逆定理 被引量:1

The Direct and Inverse Theorems forApproximation of the SikkemaKantrovitch Operators of Order K
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摘要 利用Ditizan Totik光滑模讨论了K阶Sikkema Kantorovitch算子的逼近问题,给出了它的强型正定理和弱型逆定理 在逆定理中取消了对αn的限制,从而很容易得到其逼近的特征刻化. The approximation of the sikkemaKantorovitch operators of order K are discussed by using of the DitizanTotik modulus of smoothness,and the strongtype direct theorem and the weaktype inverse theorem of the appoximation are given.The inverse theorem has not limit for αn,thus its approximation characterization is easily obtained.
作者 吴雁
出处 《烟台大学学报(自然科学与工程版)》 CAS 2002年第4期235-240,共6页 Journal of Yantai University(Natural Science and Engineering Edition)
关键词 K阶Sikkema-Kantorovitch算子 正弱型逆定理 Ditizan-Totik光滑模 算子逼近 强型正定理 SikkemaKantorovitch operators of order K approximation direct and inverse theorems
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参考文献6

  • 1Ding CaoJia.On sikkema-Kantorovic polynomials of order K[J].Approx Theory and Its Appl,1989,5(2):99~109.
  • 2Nagel J.Kantorovic operators of second order[J].Monatschefte Math,1993,91(1):33~41.
  • 3吴雁,夏茂辉.Sikkema-Kantorovitch算子的L^p逼近[J].烟台大学学报(自然科学与工程版),1998,11(3):157-162. 被引量:5
  • 4梅家明.K 阶 Sikkema-Kantorovi算子的 L_P 逼近[J].数学杂志,1993,13(3):269-272. 被引量:2
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二级参考文献3

  • 1Zhou Dingxuan. Uniform approximation by some Durrmeyer operators[J] 1990,Approximation Theory and its Applications(2):87~100
  • 2Cao Jiading. On Sikkema-Kantorovi? polynomials of order K[J] 1989,Approximation Theory and its Applications(2):99~109
  • 3Josef Nagel. Kantorovi? operators of second order[J] 1983,Monatshefte für Mathematik(1):33~44

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