Found 894 Documents (Results 1–100)
Entire symmetric operators in de Branges-Pontryagin spaces and a truncated matrix moment problem. (English) Zbl 07920223
On the structure of the kernel of the Schwarz problem for first-order elliptic systems on the plane. (English. Russian original) Zbl 07915882
Differ. Equ. 60, No. 5, 603-613 (2024); translation from Differ. Uravn. 60, No. 5, 632-642 (2024).
MSC:
65Mxx
Norm convergence of subsequences of matrix transform means of Walsh-Fourier series. (English) Zbl 07915705
MSC:
42C10
Deformed semicircle law and concentration of nonlinear random matrices for ultra-wide neural networks. (English) Zbl 07899436
An effective computational solver for fractal-fractional 2D integro-differential equations. (English) Zbl 07895379
Sample and computationally efficient stochastic kriging in high dimensions. (English) Zbl 07887718
MSC:
90Cxx
A generalization of Ando’s dilation, and isometric dilations for a class of tuples of \(q\)-commuting contractions. (English) Zbl 07885444
An adaptive factorized Nyström preconditioner for regularized kernel matrices. (English) Zbl 1543.65033
The spectrum of some Hardy kernel matrices. (Le spectre de certaines matrices du noyau de Hardy.) (English. French summary) Zbl 07877206
\(\mathbb{A}\)-Berezin number inequalities for \(2\times 2\) operator matrices. (English) Zbl 07873947
Full-rank orthonormal bases for conditionally positive definite kernel-based spaces. (English) Zbl 1540.41011
On the Fredholm determinant of the confluent hypergeometric kernel with discontinuities. (English) Zbl 1541.37072
Kernel embedding of measures and low-rank approximation of integral operators. (English) Zbl 07845550
Causal perturbative QED and white noise. (English. Russian original) Zbl 1535.81187
Theor. Math. Phys. 218, No. 3, 483-502 (2024); translation from Teor. Mat. Fiz. 218, No. 3, 559-585 (2024).
Harnack parts for 4-by-4 truncated shift. (English) Zbl 07833705
Adv. Oper. Theory 9, No. 1, Paper No. 11, 21 p. (2024); corrigendum ibid. 9, No. 2, Paper No. 17, 1 p. (2024).
Three families of matrices. (English) Zbl 07820969
Novel numerical approach for time fractional equations with nonlocal condition. (English) Zbl 1534.65146
Truncations of random unitary matrices drawn from Hua-Pickrell distribution. (English) Zbl 07918449
Albrecht, Ernst (ed.) et al., Multivariable operator theory. The Jörg Eschmeier memorial volume. Cham: Birkhäuser. 491-514 (2023).
Dilations and operator models of \({\mathcal{W}}\)-hypercontractions. (English) Zbl 07918436
Albrecht, Ernst (ed.) et al., Multivariable operator theory. The Jörg Eschmeier memorial volume. Cham: Birkhäuser. 119-154 (2023).
Three dimensional meshfree analysis for time-Caputo and space-Laplacian fractional diffusion equation. (English) Zbl 07849676
Reduced basis method for the nonlinear Poisson-Boltzmann equation regularized by the range-separated canonical tensor format. (English) Zbl 07832185
On some systems of nonlinear integral equations on the whole axis with monotonous Hammerstein-Volterra type operators. (English) Zbl 07823359
MSC:
45G05
Impact of signal-to-noise ratio and bandwidth on graph Laplacian spectrum from high-dimensional noisy point cloud. (English) Zbl 1542.05100
Norm and almost everywhere convergence of matrix transform means of Walsh-Fourier series. (English) Zbl 1532.42033
Well-posedness and convergence analysis of a nonlocal model with singular matrix kernel. (English) Zbl 1538.45022
Data-driven linear complexity low-rank approximation of general kernel matrices: a geometric approach. (English) Zbl 07790637
MSC:
65F55
Bayesian modeling of interaction between features in sparse multivariate count data with application to microbiome study. (English) Zbl 07789362
MSC:
62Pxx
Solving nonlinear Volterra integral equations of the first kind with discontinuous kernels by using the operational matrix method. (English) Zbl 1530.65185
Inequalities and equalities on the joint and generalized spectral and essential spectral radius of the Hadamard geometric mean of bounded sets of positive kernel operators. (English) Zbl 07776602
Reviewer: Mohammed El Aïdi (Bogotá)
A hybrid stochastic interpolation and compression method for kernel matrices. (English) Zbl 07766213
Analog of Schoenberg’s theorem for \(a\)-conditionally negative definite matrix-valued kernels. (English. Russian original) Zbl 1526.15031
Math. Notes 114, No. 1, 66-76 (2023); translation from Mat. Zametki 114, No. 1, 81-93 (2023).
MSC:
15B48
Operators without eigenvalues in finite-dimensional vector spaces: essential uniqueness of the model. (English) Zbl 1543.47029
On characteristic invariants of matrix pencils and linear relations. (English) Zbl 1528.15012
Reviewer: John D. Dixon (Ottawa)
Totally positive kernels, Pólya frequency functions, and their transforms. (English) Zbl 07748082
Reviewer: Adhemar Bultheel (Leuven)
Development of the Berezin number inequalities. (English) Zbl 07739308
Reviewer: Mohammad Sal Moslehian (Mashhad)
Infinite-dimensional stochastic transforms and reproducing kernel Hilbert space. (English) Zbl 07739023
MSC:
47B32
41A15
41A65
42A82
42C15
46E22
47A05
47N10
60G15
62H25
68T07
81S05
90C20
94A08
94A12
94A20
Transformations in semi-parametric Bayesian synthetic likelihood. (English) Zbl 1543.62177
MSC:
62-08
On non-uniqueness of pressures in problems of fluid filtration in fractured-porous media. (English) Zbl 1531.65108
Norm-parallelism of Hilbert space operators and the Davis-Wielandt Berezin number. (English) Zbl 1543.47055
Reviewer: Mohammad Sal Moslehian (Mashhad)
Commuting operators over Pontryagin spaces with applications to system theory. (English) Zbl 07667101
Reviewer: Kamran Sharifi (Shahrood)
Truncations of random unitary matrices drawn from Hua-Pickrell distribution. (English) Zbl 1502.60007
Uniform approximations for randomized Hadamard transforms with applications. (English) Zbl 07774368
Leonardi, Stefano (ed.) et al., Proceedings of the 54th annual ACM SIGACT symposium on theory of computing, STOC ’22, Rome, Italy June 20–24, 2022. New York, NY: Association for Computing Machinery (ACM). 659-671 (2022).
MSC:
68Qxx
Hypercontractions and factorizations of multipliers in one and several variables. (English) Zbl 1538.47013
Reviewer: Mihai Putinar (Santa Barbara)
On one construction method for Hadamard matrices. (English. Russian original) Zbl 1537.94101
Probl. Inf. Transm. 58, No. 4, 306-328 (2022); translation from Probl. Peredachi Inf. 58, No. 4, 13-37 (2022).
Reviewer: Thomas Britz (Sydney)
Solving the pure Neumann problem by a mixed finite element method. (Russian. English summary) Zbl 07668685
Characterization of pure contractive multipliers and applications. (English) Zbl 1539.47026
Reviewer: Pal Sourav (Mumbai)
On the \(R\)-matrix identities related to elliptic anisotropic spin Ruijsenaars-Macdonald operators. (English. Russian original) Zbl 1516.81107
Theor. Math. Phys. 213, No. 2, 1543-1559 (2022); translation from Teor. Mat. Fiz. 213, No. 2, 268-286 (2022).
Norms of basic operators in vector valued model spaces and de Branges spaces. (English) Zbl 1512.30015
Reviewer: Davide Buoso (Alessandria)
Boltzmann-Gibbs random fields with mesh-free precision operators based on smoothed particle hydrodynamics. (English) Zbl 1515.60154
Multivariable Beurling-Lax representations: the commutative and free noncommutative settings. (English) Zbl 1516.47017
Reviewer: Sergei S. Platonov (Petrozavodsk)
A new directional algebraic fast multipole method based iterative solver for the Lippmann-Schwinger equation accelerated with HODLR preconditioner. (English) Zbl 1508.65149
Efficient randomized tensor-based algorithms for function approximation and low-rank kernel interactions. (English) Zbl 1505.65184
Interpolating sequences and the Toeplitz-Corona theorem on the symmetrized bidisk. (English) Zbl 1524.46034
Learning in high-dimensional feature spaces using ANOVA-based fast matrix-vector multiplication. (English) Zbl 1496.65243
The matrix representation of a composition operator on the Hardy space. (English) Zbl 1512.47045
Reviewer: Kehe Zhu (Albany)
Non parametric covariance model with circular condition and its application. (English) Zbl 07596358
MSC:
62-XX
On the closeness of the incompatibility criteria for the original and perturbed systems of equations. (Russian. English summary) Zbl 1495.65052
MSC:
65F20
Randomized approximate class-specific kernel spectral regression analysis for large-scale face verification. (English) Zbl 07570152
MSC:
68T05
Adaptive regularised kernel-based identification method for large-scale systems with unknown order. (English) Zbl 1497.93046
Partial isometries, duality, and determinantal point processes. (English) Zbl 1500.60024
Reviewer: Viktor Ohanyan (Erevan)
Geometry of \(m\)-Hessian equations. (English. Russian original) Zbl 1489.53019
J. Math. Sci., New York 263, No. 3, 445-461 (2022); translation from Itogi Nauki Tekh., Ser. Sovrem. Mat. Prilozh., Temat. Obz. 169, 98-115 (2019).
Fast deterministic approximation of symmetric indefinite kernel matrices with high dimensional datasets. (English) Zbl 1508.65040
Stein’s method, heat kernel, and linear functions on the orthogonal groups. (English) Zbl 1525.60013
Reviewer: Enrico Jabara (Venezia)
Isometric dilations of commuting contractions and Brehmer positivity. (English) Zbl 1503.47011
Reviewer: Jaydeb Sarkar (Bangalore)
A computationally efficient strategy for time-fractional diffusion-reaction equations. (English) Zbl 1524.65339
Legendre polynomials approximation method for solving Volterra integral equations of the first kind with discontinuous kernels. (English) Zbl 1495.65237
Reviewer: Josef Kofroň (Praha)
Smooth bootstrapping of copula functionals. (English) Zbl 07524980
MSC:
62-XX
Least squares regression principal component analysis: a supervised dimensionality reduction method. (English) Zbl 07511592
Discrete self-adjoint Dirac systems: asymptotic relations, Weyl functions and Toeplitz matrices. (English) Zbl 1486.39024
A symmetric matrix-variate normal local approximation for the Wishart distribution and some applications. (English) Zbl 1520.62051
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