共查询到20条相似文献,搜索用时 62 毫秒
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本文对推广的Kantorovich多项式算子,在满足一定条件下,得出了算子逼近过程中的一个整体逆定理,从而推广了文献(1)中Z‘Ditzian的结果。 相似文献
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本文在引进了推广的Kantorovich多项式算子的条件下,假设(an)有界得到了该算子在逼近过程中的局部逆定理,从而推广了文献「1」中Z-Ditzian的结果。 相似文献
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本文对推广的Kantorovich多项式算子,在满足一定条件下,得出了算子逼近过程中的一个整体逆定理,从而推广了文献[1]中Z.Ditzian的结果. 相似文献
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本文在引进了推广的Kantorovich多项式算子的条件下,假设{αn}有界得到了该算子在逼近过程中的局部逆定理,从而推广了文献[1]中Z.Ditzian的结果. 相似文献
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给出了推广的Bernstein-kantorovich多项式的一个饱和性定理,刻划了达到最佳收敛速度的函数类。纠正了Z.Ditzian中定理4.2的错误,并且给出了一般性正定理。 相似文献
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利用Ditzian-Totik光滑模,研究了推广的Kantorovich算子在Ba空间中的逼近,得到逼近的正定理与等价定理.所得结果改进、推广和统一了一些作者的结果. 相似文献
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应用复合算子研究E0(p,q)空间,当p=2时,它就是Qq,0,当P>0且q>1时,它就是小 Bloch空间B0.讨论了复合算子的紧性并利用Carleson测度给出复合算子是紧的判别准则. 相似文献
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Abstract We prove a global Inverse Map Theorem for a map f from the Heisenberg group into itself, provided the Pansu differential of f is continuous, non singular and satisfies some growth conditions at infinity. An estimate for the Lipschitz constant (with
respect to the Carnot–Carathéodory distance in
) of a continuously Pansu differentiable map is included. This gives a characterization of (continuously Pansu differentiable)
globally biLipscitz deformations of
in term of a pointwise estimate of their differential.
Keywords: Inverse problem, Heisenberg group 相似文献
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Mediterranean Journal of Mathematics - In the present paper, we prove a global inverse theorem for approximation of bounded continuous functions on the interval [0, ∞) by linear combinations... 相似文献
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Foundations of Computational Mathematics - Regularization addresses the ill-posedness of the training problem in machine learning or the reconstruction of a signal from a limited number of... 相似文献
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We consider the eigenvalue problem in Ω Where Ω is a bounded domain in Rd with smooth boundary,a nd q is a bounded, measurable function on Ω The eigenvalue problem has discrete spectrum; we denote by and a nondecreasing sequence of eigenvalue and corresponding (orthonormal) eigenfunctions. It is known ([N–S–U]) that knowledge of the eigenvalues and the boundary values of the normal derivatives of the corresponding eigenfunctions is sufficient to uniquely determine a coefficient, q. 相似文献