Results 71 to 80 of about 1,173,022 (231)
Asymmetric truncated Toeplitz operators and Toeplitz operators with matrix symbol [PDF]
Journal of Operator Theory, 2017 Truncated Toeplitz operators and their asymmetric versions are studied in the context of the Hardy space $H^p$ of the half-plane for ...
Câmara, M. Cristina +1 more
openaire +2 more sources
On semibounded Toeplitz operators
, 2016 We show that a semibounded Toeplitz quadratic form is closable in the space $\ell^2({\Bbb Z}_{+})$ if and only if its matrix elemens are Fourier coefficients of an absolutely continuous measure.
Yafaev, D. R.
core +3 more sources
Magnetic Resonance in Medicine, Volume 95, Issue 5, Page 2702-2717, May 2026.ABSTRACT Purpose To achieve high resolution (≤ 1 mm isotropic) whole‐brain perfusion imaging at 7 T with next generation ASL pulse sequence, reconstruction algorithm, and MRI hardware. Methods We capitalized on three major innovations: (1) FLASH‐based pseudo‐Continuous ASL (pCASL) sequence with rotated golden‐angle stack‐of‐spirals (rGA‐SoS) sampling; (
Chenyang Zhao +8 more
wiley +1 more source
Open Mathematics, 2015 In this paper, the boundedness properties for some Toeplitz type operators associated to the Riesz potential and general integral operators from Lebesgue spaces to Orlicz spaces are proved.
Chen Dazhao
doaj +1 more source
Bounds for Toeplitz Determinants and Related Inequalities for a New Subclass of Analytic Functions
Mathematics, 2023 In this article, we use the q-derivative operator and the principle of subordination to define a new subclass of analytic functions related to the q-Ruscheweyh operator.
Huo Tang +3 more
doaj +1 more source
Acta Obstetricia et Gynecologica Scandinavica, Volume 105, Issue 5, Page 912-921, May 2026.Epidural analgesia during the first stage of labor shows no clinically relevant changes in uterine contraction frequency and duration, but it is associated with a significant reduction in uterine intensity. Their clinical implications need further research.
Phebe B. Q. Berben +10 more
wiley +1 more source
Calculation of the Density of States Using Discrete Variable Representation and Toeplitz Matrices
, 1995 A direct and exact method for calculating the density of states for systems with localized potentials is presented. The method is based on explicit inversion of the operator $E-H$.
+21 more
core +1 more source
Quantum Time‐Marching Algorithms for Solving Linear Transport Problems Including Boundary Conditions
International Journal for Numerical Methods in Engineering, Volume 127, Issue 8, 30 April 2026.ABSTRACT This article presents the first complete application of a quantum time‐marching algorithm for simulating multidimensional linear transport phenomena with arbitrary boundaries, whereby the success probabilities are problem intrinsic. The method adapts the linear combination of unitaries algorithm to block encode the diffusive dynamics, while ...
Sergio Bengoechea +2 more
wiley +1 more source
Fredholmness and compactness of truncated Toeplitz and Hankel operators
, 2014 We prove the spectral mapping theorem $\sigma_e(A_\phi) = \phi(\sigma_e(A_z))$ for the Fredholm spectrum of a truncated Toeplitz operator $A_\phi$ with symbol $\phi$ in the Sarason algebra $C+H^\infty$ acting on a coinvariant subspace $K_\theta$ of the ...
Bessonov, R. V.
core +1 more source
Toeplitz operators on concave corners and topologically protected corner states [PDF]
Letters in Mathematical Physics, 2019 We consider Toeplitz operators defined on a concave corner-shaped subset of the square lattice. We obtain a necessary and sufficient condition for these operators to be Fredholm.
S. Hayashi
semanticscholar +1 more source