Results 101 to 110 of about 475,064 (272)
A Uniformly Convergent Scheme for Singularly Perturbed Unsteady Reaction–Diffusion Problems
Journal of Applied Mathematics, Volume 2025, Issue 1, 2025.In the present work, a class of singularly perturbed unsteady reaction–diffusion problem is considered. With the existence of a small parameter ε, (0 < ε ≪ 1) as a coefficient of the diffusion term in the proposed model problem, there exist twin boundary layer regions near the left end point x = 0 and right end point x = 1 of the spatial domain.
Amare Worku Demsie +3 more
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New norm equalities and inequalities for operator matrices
Journal of Inequalities and Applications, 2016 We prove new inequalities for general 2 × 2 $2\times2$ operator matrices. These inequalities, which are based on classical convexity inequalities, generalize earlier inequalities for sums of operators. Some other related results are also presented. Also,
Feras Ali Bani-Ahmad, Watheq Bani-Domi
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A New Generalization of Leonardo Sequences: Biperiodic Leonardo Sequence
Journal of Mathematics, Volume 2025, Issue 1, 2025.In this study, we define a new type of number sequence called biperiodic Leonardo sequence by the recurrence relation Lena,b=aLen−1+Len−2+1 (for even n) and Lena,b=bLen−1+Len−2+1 (for odd n) with the initial conditions Le0a,b=Le1a,b=1. We obtained the characteristic function, generating function, and Binet’s formula for this sequence and propose a ...
Hasan Gökbaş, Mohammad W. Alomari
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An interlacing theorem for tridiagonal matrices
Linear Algebra and its Applications, 1991 AbstractIf A is an n × n matrix and if S ⊂{1,…,n}, then let A(S) denote the principal submatrix of A formed by rows and columns in S. If A, B are n × n matrices, then let η(A,B)=∑sdet A(S) det B(S′), where the summation is over all subsets of {1,…,n}, where S′ denotes the complement of S, and where, by convention det A(φ) = det B(φ) = 1.
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On the Spectra and Pseudospectra of a Class of Non-Self-Adjoint Random Matrices and Operators
, 2013 In this paper we develop and apply methods for the spectral analysis of non-self-adjoint tridiagonal infinite and finite random matrices, and for the spectral analysis of analogous deterministic matrices which are pseudo-ergodic in the sense of E.B ...
Chandler-Wilde, Simon N. +2 more
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Journal of Mathematics, Volume 2025, Issue 1, 2025.The present investigation proposes a unique strategy for the establishment of a controllable queuing system using Markovian modeling. In comparison to conventional models, this approach combines customer impatience, feedback procedure, and working vacation into the statistical modeling of queues in a novel manner.
Shreekant Varshney +6 more
wiley +1 more source
Behavior of Salt Transport in Concrete Structures Under Temperature and Moisture Gradients
Modelling and Simulation in Engineering, Volume 2025, Issue 1, 2025.Concrete is one of the materials most widely used in building construction. The deterioration of foundations and load‐bearing structures can cause economic and environmental damage to such building types. Concrete degradation can occur in several ways due to mechanical stresses, climatic changes, and chemical attacks, such as the migration of salts ...
Rhayssa M. M. Ribas +3 more
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A rational‐Chebyshev projection method for nonlinear eigenvalue problems
Numerical Linear Algebra with Applications, Volume 31, Issue 6, December 2024.Abstract This article describes a projection method based on a combination of rational and polynomial approximations for efficiently solving large nonlinear eigenvalue problems. In a first stage the nonlinear matrix function T(λ)$$ T\left(\lambda \right) $$ under consideration is approximated by a matrix polynomial in λ$$ \lambda $$.
Ziyuan Tang, Yousef Saad
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A theorem on inverse of tridiagonal matrices
Linear Algebra and its Applications, 1979 AbstractTridiagonal or Jacobi matrices arise in many diverse branches of mathematics and have been studied extensively. However, there is little written about the inverses of such matrices. In this paper we characterize those matrices with nonzero diagonal elements whose inverses are tridiagonal. The arguments given are elementaryand show that matrices
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The c-numerical range of tridiagonal matrices
Linear Algebra and its Applications, 2001 AbstractWe give sufficient conditions for the c-numerical range of a tridiagonal matrix to be an elliptic disc, which generalize known results on the classical numerical range.
Hiroshi Nakazato, Mao-Ting Chien
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