Results 11 to 20 of about 173,375 (235)
The Diagonalizable Nonnegative Inverse Eigenvalue Problem
Special Matrices, 2018 In this articlewe provide some lists of real numberswhich can be realized as the spectra of nonnegative diagonalizable matrices but which are not the spectra of nonnegative symmetric matrices.
Cronin Anthony G, Laffey Thomas J.
doaj +5 more sources
Row stochastic inverse eigenvalue problem [PDF]
Journal of Inequalities and Applications, 2011 In this paper, we give sufficient conditions or realizability criteria for the existence of a row stochastic matrix with a given spectrum Λ = {λ1, ..., λn} = Λ1 ∪ ⋯ ∪ Λm ∪ Λm+1, m > 0; where (pk ...
Chang-qing Xu, Shang-jun Yang
doaj +3 more sources
Inverse Eigenvalue Problem of Unitary Hessenberg Matrices [PDF]
Discrete Dynamics in Nature and Society, 2009 Let H∈ℂn×n be an n×n unitary upper Hessenberg matrix whose subdiagonal elements are all positive, let Hk be the kth leading principal submatrix of H, and let H˜k be a modified submatrix of Hk.
Chunhong Wu, Linzhang Lu
doaj +3 more sources
Extremal inverse eigenvalue problem for irreducible acyclic matrices
Applied Mathematics in Science and Engineering, 2022 In this paper, we study the inverse eigenvalue problem of constructing symmetric matrices whose graph is a tree, i.e. of constructing irreducible acyclic matrices from given eigendata consisting of the smallest and largest eigenvalues of their leading ...
Debashish Sharma, Bhaba Kumar Sarma
doaj +1 more source
ADAPTIVE SOLUTION OF THE NEUTRON DIFFUSION EQUATION WITH HETEROGENEOUS COEFFICIENTS USING THE MIXED FINITE ELEMENT METHOD ON STRUCTURED MESHES [PDF]
EPJ Web of Conferences, 2021 The neutron transport equation can be used to model the physics of the nuclear reactor core. Its solution depends on several variables and requires a lot of high precision computations.
Do Minh-Hieu +2 more
doaj +1 more source
The Recursive Inverse Eigenvalue Problem [PDF]
SIAM Journal on Matrix Analysis and Applications, 2000 The following recursive inverse eigenvalue problem of order \(n\) (\(\mathbf{RIEP}(n)\)) is investigated: Let \(F\) be a field, let \(s_1,\dots,s_n\in F\), and \(l_1,r_1\in F^{1\times 1}\), \(l_2,r_2\in F^{2\times 2},\dots,l_n,r_n\in F^{n\times n}\). Construct a matrix \(A\in F^{n\times n}\) such that \(l_i^{\top}A\langle i\rangle=s_il_i^{\top}\), \(A ...
Arav, Marina +3 more
openaire +1 more source
Inverse Eigenvalue Problem and Least-Squares Problem for Skew-Hermitian {P,K + 1}-Reflexive Matrices
Journal of Mathematics, 2022 This paper involves related inverse eigenvalue problem and least-squares problem of skew-Hermitian {P,k + 1}-reflexive(antireflexive) matrices and their optimal approximation problems.
Chang-Zhou Dong, Hao-Xue Li
doaj +1 more source
A Note on NIEP for Leslie and Doubly Leslie Matrices
Mathematics, 2020 The nonnegative inverse eigenvalue problem (NIEP) consists of finding necessary and sufficient conditions for the existence of a nonnegative matrix with a given list of complex numbers as its spectrum.
Luis Medina, Hans Nina, Elvis Valero
doaj +1 more source
Open Mathematics, 2020 Left and right inverse eigenpairs problem is a special inverse eigenvalue problem. There are many meaningful results about this problem. However, few authors have considered the left and right inverse eigenpairs problem with a submatrix constraint.
Li Fan-Liang
doaj +1 more source
Identification of discontinuous parameters in double phase obstacle problems
Advances in Nonlinear Analysis, 2022 In this article, we investigate the inverse problem of identification of a discontinuous parameter and a discontinuous boundary datum to an elliptic inclusion problem involving a double phase differential operator, a multivalued convection term (a ...
Zeng Shengda +3 more
doaj +1 more source