Results 21 to 30 of about 4,117 (168)
Product of Matrix Valued Truncated Toeplitz Operators
, 2020 Let $A_\Phi$ be a matrix valued truncated Toeplitz operator-the compression of multiplication operator to vector-valued model space $H^2(E)\ominus \Theta H^2(E)$, where $\Theta$ is a matrix valued non constant inner function.
Khan, Muhammad Ahsan
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Matrix Representations of Asymmetric Truncated Toeplitz Operators [PDF]
Bulletin of the Malaysian Mathematical Sciences Society, 2020 AbstractIn this paper, we describe the matrix representations of asymmetric truncated Toeplitz operators acting between two finite-dimensional model spaces$$K_1$$K1and$$K_2$$K2. The novelty of our approach is that here we consider matrix representations computed with respect to bases of different type in$$K_1$$K1and$$K_2$$K2(for example, kernel basis ...
Joanna Jurasik, Bartosz Łanucha
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Neural Fields for Highly Accelerated 2D Cine Phase Contrast MRI
Advanced Science, EarlyView.ABSTRACT 2D cine phase contrast (CPC) MRI provides quantitative information on blood velocity and flow within the human vasculature. However, data acquisition is time‐consuming, motivating the reconstruction of the velocity field from undersampled measurements to reduce scan times. In this work, neural fields are proposed as a continuous spatiotemporal
Pablo Arratia +7 more
wiley +1 more source
Quasi-Toeplitz matrix arithmetic: a MATLAB toolbox [PDF]
, 2019 A quasi-Toeplitz (QT) matrix is a semi-infinite matrix of the kind A= T(a) + E where T(a)=(aj−i)i,j∈Z+, E=(ei,j)i,j∈Z+ is compact and the norms∥a∥W=∑i∈Z|ai| and ∥ E∥ 2 are finite.
Massei S., Bini D. A., Robol L.
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The asymptotic spectrum of flipped multilevel Toeplitz matrices and of certain preconditionings [PDF]
, 2021 In this work, we perform a spectral analysis of flipped multilevel Toeplitz sequences, i.e., we study the asymptotic spectral behavior of $\{Y_{{n}} T_{{n}} (f)\}_{{n}}$, where $T_{{n}}(f)$ is a real, square multilevel Toeplitz matrix generated by a ...
PESTANA J. +3 more
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Asian Journal of Control, EarlyView.Abstract Large swarms often adopt a hierarchical network structure that incorporates information aggregation. Although this approach offers significant advantages in terms of communication efficiency and computational complexity, it can also lead to degradation due to information constraints.
Kento Fujita, Daisuke Tsubakino
wiley +1 more source
Forecasting With Dynamic Factor Models Estimated by Partial Least Squares
Journal of Forecasting, EarlyView.ABSTRACT Dynamic factor models (DFMs) have found great success in nowcasting and short‐term macroeconomic forecasting when incorporating large sets of predictive information. The factor loadings are typically estimated cross‐sectionally with principal component analysis (PCA) or maximum likelihood (ML), which ignore whether the factors have predictive ...
Samuel Rauhala
wiley +1 more source
The spectra of preconditioned Toeplitz matrix sequences can have gaps
, 2004 Different than for the case of Toeplitz matrix sequences $\{T_n(f)\}$, $f\in L^1$, we can prove that the closure of the union of all the spectra of preconditioned matrix sequences of the form $\{T_n^{-1}(g)T_n(f)\}$, $f,g\in L^1$, $g\ge 0$, can have gaps
Huckle, T., SERRA CAPIZZANO, STEFANO
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Multidimensional Toeplitz and Truncated Toeplitz Operators [PDF]
, 2021 In this thesis we extend previous studies of Toeplitz and truncated Toeplitz operators by studying both Toeplitz and truncated Toeplitz operators with matrix symbols.
O'Loughlin, Ryan
core
On the Frobenius norm of commutator of Cauchy-Toeplitz matrix and exchange matrix
, 2023 Matrix commutator and anticommutator play an important role in mathematics, mathematical physic, and quantum physic. The commutator and anticommutator of two n × n complex matrices A and B are defined by [A,B] = AB − BA and (A,B) = AB + BA, respectively.
Bahşi, Mustafa, Solak, Süleyman
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