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In this paper, we establish quantitative estimates for nonlinear sampling Kantorovich operators in terms of the modulus of continuity in the setting of Orlicz spaces. This general frame allows us to directly deduce some quantitative…

泛函分析 · 数学 2021-02-18 Nursel Cetin , Danilo Costarelli , Gianluca Vinti

The main purpose of this paper is to determine the approximations of Durrmeyer modification of Szasz-Mirakjan operators, defined by Mishra et al. (Boll. Unione Mat. Ital. (2016) 8(4):297-305). We estimate the order of approximation of the…

泛函分析 · 数学 2020-02-14 Rishikesh Yadav , Ramakanta Meher , Vishnu Narayan Mishra

Our main aim is to investigate the approximation properties for the summation integral type operators in a statistical sense. In this regard, we prove the statistical convergence theorem using well known Korovkin theorem and the degree of…

泛函分析 · 数学 2019-12-24 Rishikesh Yadav , Ramakanta Meher , Vishnu Narayan Mishra

We present several operator versions of the Dunkl--Williams inequality with respect to the $p$-angular distance for operators. More precisely, we show that if $A, B \in \mathbb{B}(\mathscr{H})$ such that $|A|$ and $|B|$ are invertible,…

算子代数 · 数学 2012-03-22 F. Dadipour , M. Fujii , M. S. Moslehian

We solve an interpolation problem in $A^p_\alpha$ involving specifying a set of (possibly not distinct) $n$ points, where the $k^{\textrm{th}}$ derivative at the $k^{\textrm{th}}$ point is up to a constant as large as possible for functions…

复变函数 · 数学 2018-05-18 Soumyadip Acharyya , Timothy Ferguson

In this paper, we introduce a Kantorovich version of the Bernstein-type logarithmic operators. The idea comes from the wide literature concerning exponential polynomials that preserve exponential functions: here, the exponential weights are…

泛函分析 · 数学 2026-02-12 Laura Angeloni , Danilo Costarelli , Chiara Darielli

We study the pointwise convergence of Landau type Schr\"odinger operators within the fractional Sobolev space $W^{s,p}(\mathbb R)$. Our results extend those established by Bailey (Rev. Mat. Iberoam., 29 (2): 531-546, 2013) and Yuan, Zhao…

偏微分方程分析 · 数学 2025-06-02 Yucheng Pan , Wenchang Sun

Let $\mathcal{M}$ be a semifinite von Neumann algebra equipped with a semifinite normal faithful trace $\tau$. Let $d$ be an injective positive measurable operator with respect to $(\mathcal{M}, \tau)$ such that $d^{-1}$ is also measurable.…

算子代数 · 数学 2009-07-16 Éric Ricard , Quanhua Xu

In this paper, we introduce a modification of the Szasz-Mirakjan-Kantorovich operators as well as Stancu operators [9] (or a Dunkl generalization of modified Szasz-Mirakjan-Kantrovich operators [5]) which preserve the linear functions.…

经典分析与常微分方程 · 数学 2016-04-06 M. Mursaleen , Md. Nasiruzzaman

This article contributes to the new summation of Sz\'asz operators with the help of Appell polynomials of class $A^{2}$. We verified Bohman-Korovkin's theorem and prove the convergence results like Lipschitz-type space, Voronvaskaja-type…

经典分析与常微分方程 · 数学 2023-08-08 Naokant Deo , Chandra Prakash , D. K. Verma

This paper studies approximation properties of linear sampling operators in general Banach lattices $X$. We obtain matching direct and inverse approximation estimates, convergence criteria, equivalence results involving special…

泛函分析 · 数学 2026-01-28 Yurii Kolomoitsev

We study ergodicity of composition operators on rearrangement-invariant Banach function spaces. More precisely, we give a natural and easy-to-check condition on the symbol of the operator which entails mean ergodicity on a very large class…

泛函分析 · 数学 2025-10-15 Thomas Kalmes , Dalimil Peša

We prove that the class of trilinear multiplier forms with singularity over a one dimensional subspace, including the bilinear Hilbert transform, admit bounded $L^p$-extension to triples of intermediate $\mathrm{UMD}$ spaces. No other…

经典分析与常微分方程 · 数学 2019-10-07 Francesco Di Plinio , Kangwei Li , Henri Martikainen , Emil Vuorinen

We prove $L^p$ bounds for the extensions of standard multilinear Calder\'on-Zygmund operators to tuples of UMD spaces tied by a natural product structure. This can, for instance, mean the pointwise product in UMD function lattices, or the…

经典分析与常微分方程 · 数学 2020-08-17 Francesco Di Plinio , Kangwei Li , Henri Martikainen , Emil Vuorinen

In this paper we introduce a class of BMO spaces which interpolate with $L_p$ and are sufficiently large to serve as endpoints for new singular integral operators. More precisely, let $(\Omega, \Sigma, \mu)$ be a $\sigma$-finite measure…

经典分析与常微分方程 · 数学 2016-01-20 Jose M. Conde-Alonso , Tao Mei , Javier Parcet

In this paper, we give direct theorems on point wise and global approximation by new variants of Bernstein-Durrmeyer operator, introduced by A.-M. et al.[1].

经典分析与常微分方程 · 数学 2020-05-11 Asha Ram Gairola , Karunesh Kumar Singh

We study uniform $\epsilon-$BPB approximations of bounded linear operators between Banach spaces from a geometric perspective. We show that for sufficiently small positive values of $\epsilon,$ many geometric properties like smoothness,…

泛函分析 · 数学 2024-08-14 Debmalya Sain , Arpita Mal , Kalidas Mandal , Kallol Paul

In the present paper, we introduce the generalized form of $(p,q)$ Baskakov-Durrmeyer Operators with Stancu type parameters. We derived the local and global approximation properties of these operators and obtained the convergence rate and…

经典分析与常微分方程 · 数学 2016-02-24 Vishnu Narayan Mishra , Shikha Pandey

We prove the operator space Grothendieck inequality for bilinear forms on subspaces of noncommutative $L_p$-spaces with $2<p<\infty$. One of our results states that given a map $u: E\to F^*$, where $E, F\subset L_p(M)$ ($2<p<\infty$, $M$…

泛函分析 · 数学 2007-05-23 Quanhua Xu

In this paper, we introduce a new family of Szasz-Mirakyan-Durrmeyer operators defined on the half-line [0,\infty), constructed using Laguerre-type kernels. We discuss in detail the algebraic structure and analytical properties of these…

综合数学 · 数学 2025-11-12 Prashantkumar G. Patel