Results 41 to 50 of about 132 (119)
International Journal of Group Theory, 2015 Summary: Quasinormal subgroups have been studied for nearly 80 years. In finite groups, questions concerning them invariably reduce to \(p\)-groups, and here they have the added interest of being invariant under projectivities, unlike normal subgroups. However, it has been shown recently that certain groups, constructed by \textit{F. Gross} and \textit{
Cossey, Peter John, Stonehewer, S
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Lebesgue's Differentiation Theorems in R.I. Quasi-Banach Spaces and Lorentz Spaces Γp,w
Journal of Function Spaces and Applications, 2012 The paper is devoted to investigation of new Lebesgue's type differentiation theorems (LDT) in rearrangement invariant (r.i.) quasi-Banach spaces E and in particular on Lorentz spaces Γp,w={f:∫(f ...
Maciej Ciesielski, Anna Kamińska
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Sparse Signal Recovery via Exponential Metric Approximation
Tsinghua Science and Technology, 2017 Sparse signal recovery problems are common in parameter estimation, image processing, pattern recognition, and so on. The problem of recovering a sparse signal representation from a signal dictionary might be classified as a linear constraint ℓ0 ...
Jian Pan, Jun Tang, Wei Zhu
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Variational Regularized Tree-Structured Wavelet Sparsity for CS-SENSE Parallel Imaging
IEEE Access, 2018 Both compressed sensing magnetic resonance imaging (MRI) and parallel MRI have emerged as effective techniques to accelerate MRI data acquisition in various clinical applications.
Ryan Wen Liu +4 more
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Potential trace inequalities via a Calderón‐type theorem
Journal of the London Mathematical Society, Volume 113, Issue 3, March 2026.Abstract In this paper, we develop a general theoretical tool for the establishment of the boundedness of notoriously difficult operators (such as potentials) on certain specific types of rearrangement‐invariant function spaces from analogous properties of operators that are easier to handle (such as fractional maximal operators).
Zdeněk Mihula +2 more
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Mathematika, Volume 71, Issue 4, October 2025.Abstract Let μ$\mu$ be a probability measure on R$\mathbb {R}$. We give conditions on the Fourier transform of its density for functionals of the form H(a)=∫Rnh(⟨a,x⟩)μn(dx)$H(a)=\int _{\mathbb {R}^n}h(\langle a,x\rangle)\mu ^n(dx)$ to be Schur monotone. As applications, we put certain known and new results under the same umbrella, given by a condition
Andreas Malliaris
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Quantum linear system algorithm with optimal queries to initial state preparation [PDF]
QuantumQuantum algorithms for linear systems produce the solution state $A^{-1}|b\rangle$ by querying two oracles: $O_A$ that block encodes the coefficient matrix and $O_b$ that prepares the initial state.
Guang Hao Low, Yuan Su
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Mathematical Methods in the Applied Sciences, Volume 48, Issue 12, Page 12567-12576, August 2025.ABSTRACT The significance of the Jensen inequality stems from its impactful and compelling outcomes. As a generalization of classical convexity, it plays a key role in deriving other well‐known inequalities such as Hermite–Hadamard, Hölder, Minkowski, arithmetic‐geometric, and Young's inequalities.
İzzettin Demir
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Remote Sensing, 2019 In uniform infrared scenes with single sparse high-contrast small targets, most existing small target detection algorithms perform well. However, when encountering multiple and/or structurally sparse targets in complex backgrounds, these methods ...
Fei Zhou +3 more
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Quasinormal Operators and Reflexive Subspaces
Rocky Mountain Journal of Mathematics, 2003 Let \(H\) be a separable Hilbert space and \(B(H)\) be the collection of all bounded linear operators on \(H\). An operator \(T\) is called quasinormal if \(T\) commutes with \(T^{*}T\). The reflexive closure of a subspace \(S \subset B(H)\) is the set Ref\(S=\{A \in B(H): Ax \in {\overline{Sx}}\) for all \(x \in H \}\).
Kliś, Kamila, Ptak, Marek
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