Search Results - "Matrices"

A Geometric Unification of Distributionally Robust Covariance Estimators: Shrinking the Spectrum by Inflating the Ambiguity Set.

Authors: Yue, Man-Chung Rychener, Yves Kuhn, Daniel et al.

Source: Operations Research. May/Jun2026, Vol. 74 Issue 3, p1710-1728. 19p.

Global Convergence of Hessenberg Shifted QR I: Exact Arithmetic.

Authors: Banks, Jess Garza-Vargas, Jorge Srivastava, Nikhil

Source: Foundations of Computational Mathematics; Oct2025, Vol. 25 Issue 5, p1561-1594, 34p

Sequence-Space Jacobians of Life-Cycle Models.

Authors: Bardóczy, Bence Shanker, Akshay Velásquez-Giraldo, Mateo

Source: Working Papers: U.S. Federal Reserve Board's Finance & Economic Discussion Series. Jun2026, p1-64. 65p.

A Note on Representations of the Drazin Inverse for Complex Partitioned Matrices.

Authors: Zhao, Yue Zhang, Daochang Mosić, Dijana

Source: Mathematics (2227-7390). Jun2026, Vol. 14 Issue 11, p1856. 13p.

THE RELATION BETWEEN DISTANCE LAPLACIAN SPECTRAL RADIUS AND INTEGER k-MATCHING NUMBER IN GRAPHS.

Authors: ZHANG, YANHONG ZHANG, LEI REN, HAIZHEN

Source: Transactions on Combinatorics. Jun2026, Vol. 15 Issue 2, p125-136. 12p.

THE LAPLACIAN AND DISTANCE MATRIX OF A SIGNED TREE.

Authors: HONG, ZIXUAN HOU, YAOPING XIONG, ZHUANG

Source: Transactions on Combinatorics. Jun2026, Vol. 15 Issue 2, p111-124. 14p.

Complete pivoting growth of butterfly matrices and butterfly Hadamard matrices.

Authors: Peca-Medlin, John¹ (AUTHOR) jpecamedlin@ucsd.edu

Source: Linear & Multilinear Algebra. May2026, Vol. 74 Issue 7, p934-958. 25p.

Analysis Method of Operating Characteristics and Optimal Arrangement of 500 KV Homopolar Parallel Cables.

Authors: Chen, Guoyan Zhu, Min Shu, Haisheng et al.

Source: Energies (19961073). May2026, Vol. 19 Issue 9, p2145. 23p.

Subject Terms: *Impedance matrices, *Analytic hierarchy process, *Equivalent electric circuits, *Electric cables, *Eddy currents (Electric)

Covariance Matrix Estimation in Time-Varying Factor Models.

Authors: Yao, Jingming Wu, Jianhong

Source: Studies in Nonlinear Dynamics & Econometrics. Jun2026, Vol. 30 Issue 3, p485-501. 17p.

Can realized covariance measure improve VaR forecasting of China’s new energy and financial markets? ——Evidence from the A-MRS-Copula model.

Authors: Jin, Shang Chen, Zhenlong

Source: Applied Economics. Jun2026, p1-19. 19p. 4 Illustrations.

On the form of the rotation matrix in a traditional sign-identified VAR.

Authors: Fisher, Lance A. Huh, Hyeon-Seung

Source: Applied Economics Letters. May2026, Vol. 33 Issue 9, p1465-1470. 6p.

Hidden Convexity, Optimization, and Algorithms on Rotation Matrices.

Authors: Ramachandran, Akshay Shu, Kevin Wang, Alex L.

Source: Mathematics of Operations Research (INFORMS). May2025, Vol. 50 Issue 2, p1454-1477. 24p.

Uniform multiple orthogonal polynomials and Markov chains.

Authors: Branquinho, Amílcar Díaz, Juan E. F. Foulquié-Moreno, Ana et al.

Source: Numerical Algorithms; Jul2026, Vol. 102 Issue 3, p1743-1772, 30p

Doubly stochastic matrices and modified Laplacian matrices of graphs.

Authors: Andrade, Enide Dahl, Geir

Source: Linear Algebra & its Applications; Jun2026, Vol. 739, p43-67, 25p

On uniqueness, analyticity, and first- and second-order derivatives of Sinkhorn-type DAD scalings.

Authors: Bünger, Florian¹, florian.buenger@tuhh.de

Source: Linear Algebra & its Applications; May2026, Vol. 737, p173-192, 20p

Entrywise transforms preserving matrix positivity and nonpositivity.

Authors: Guillot, Dominique Gupta, Himanshu Vishwakarma, Prateek Kumar et al.

Source: Journal of the London Mathematical Society; May2026, Vol. 113 Issue 5, p1-29, 29p

Improving High-Latitude Sea Surface Height Data Assimilation: Model Based Vertical Covariance.

Authors: Helber, Robert W. Douglass, Elizabeth M. Xu, Xiaobiao et al.

Source: Journal of Atmospheric & Oceanic Technology. May2026, Vol. 43 Issue 5, p1-21. 21p.

Subjects: Data assimilation, Covariance matrices, Oceanography, Variational approach (Mathematics), Ocean dynamics, Satellite-based remote sensing, United States. Navy, Halocline

A Unified Framework for Multiscale Spectral Generalized FEMs and Low-Rank Approximations to Multiscale PDEs.

Authors: Ma, Chupeng¹ (AUTHOR) chupeng.ma@gbu.edu.cn

Source: Foundations of Computational Mathematics. Jun2026, Vol. 26 Issue 3, p1699-1758. 60p.

Subjects: Multiscale modeling, Low-rank matrices, Green's functions, Numerical analysis, Finite element method, Spectral element method, Approximation theory, Computational mathematics

Local Geometry Determines Global Landscape in Low-Rank Factorization for Synchronization.

Authors: Ling, Shuyang¹ (AUTHOR) sl3635@nyu.edu

Source: Foundations of Computational Mathematics. Jun2026, Vol. 26 Issue 3, p1553-1585. 33p.

Subjects: Laplacian matrices, Semidefinite programming, Matrix decomposition

Research on GNSS/INS Tightly Coupled Integrity Monitoring Method Based on State Augmentation Error Modeling.

Authors: Tang, Xinhua Fang, Xiaoyu Huang, Fei

Source: Remote Sensing. May2026, Vol. 18 Issue 10, p1564. 29p.

Subjects: Markov processes, Covariance matrices, Measurement errors, Data integrity, Inertial navigation systems, Global Positioning System, Automotive navigation systems