In [-1] Chen Wenzhong introduced the following generalized Baskakov oprators where a>0,f∈C[0,∞),b_(n,k,a)(X)= The purpose of this paper is to study the convergence,Voronovskaja-type asymptotic representations and...In [-1] Chen Wenzhong introduced the following generalized Baskakov oprators where a>0,f∈C[0,∞),b_(n,k,a)(X)= The purpose of this paper is to study the convergence,Voronovskaja-type asymptotic representations and the pointwise saturation of these operators. We shall give the direct and inverse theorems of weighted approximation and of uniform approximation.展开更多
Using the equivalence relation between K-functional and moduli of smoothness, methods of partition function and induction, we establish a strong direct theorem and an inverse theorem of weak type of weighted approxima...Using the equivalence relation between K-functional and moduli of smoothness, methods of partition function and induction, we establish a strong direct theorem and an inverse theorem of weak type of weighted approximation for d-dimensional Bernstein operators on a simplex in this paper.展开更多
设S_n(f;x)表示如下的Sz(?)sz-Mirakjan算子:S_n(f;x)=sum from k=0 to ∞ f(k/n)S_(nk)(x),这里S_(nk)(x)=e^(-nx)(nx)~k/k!,x∈[0,∞),f∈C_[0,∞),C_[0,∞),表示在[0,∞)上连续且有界之函数集,1983年在[1]中给出了Sn(f;x)在一致逼近...设S_n(f;x)表示如下的Sz(?)sz-Mirakjan算子:S_n(f;x)=sum from k=0 to ∞ f(k/n)S_(nk)(x),这里S_(nk)(x)=e^(-nx)(nx)~k/k!,x∈[0,∞),f∈C_[0,∞),C_[0,∞),表示在[0,∞)上连续且有界之函数集,1983年在[1]中给出了Sn(f;x)在一致逼近意义下的特征刻划,为讨论L_p逼近,[2]中引进了如下的Sz(?)sz-Mirakjan-Kantorovich算子:展开更多
In this paper, we give the strong converse inequalities of type B with the new K-functional Kλα(f,t2)w(0 ≤λ≤ 1, 0 < α < 2) on weighted approximation for Sz′asz-Mirakjan operators, which extend the previou...In this paper, we give the strong converse inequalities of type B with the new K-functional Kλα(f,t2)w(0 ≤λ≤ 1, 0 < α < 2) on weighted approximation for Sz′asz-Mirakjan operators, which extend the previous results.展开更多
文摘In [-1] Chen Wenzhong introduced the following generalized Baskakov oprators where a>0,f∈C[0,∞),b_(n,k,a)(X)= The purpose of this paper is to study the convergence,Voronovskaja-type asymptotic representations and the pointwise saturation of these operators. We shall give the direct and inverse theorems of weighted approximation and of uniform approximation.
文摘Using the equivalence relation between K-functional and moduli of smoothness, methods of partition function and induction, we establish a strong direct theorem and an inverse theorem of weak type of weighted approximation for d-dimensional Bernstein operators on a simplex in this paper.
文摘设S_n(f;x)表示如下的Sz(?)sz-Mirakjan算子:S_n(f;x)=sum from k=0 to ∞ f(k/n)S_(nk)(x),这里S_(nk)(x)=e^(-nx)(nx)~k/k!,x∈[0,∞),f∈C_[0,∞),C_[0,∞),表示在[0,∞)上连续且有界之函数集,1983年在[1]中给出了Sn(f;x)在一致逼近意义下的特征刻划,为讨论L_p逼近,[2]中引进了如下的Sz(?)sz-Mirakjan-Kantorovich算子:
基金the Foundation of Higher School of Ningxia(04M33)the NSF of Ningxia University(ZR0622)
文摘In this paper, we give the strong converse inequalities of type B with the new K-functional Kλα(f,t2)w(0 ≤λ≤ 1, 0 < α < 2) on weighted approximation for Sz′asz-Mirakjan operators, which extend the previous results.
