Results 41 to 50 of about 442,498 (206)
On some reciprocal matrices with elliptical components of their Kippenhahn curves
Special Matrices, 2021 By definition, reciprocal matrices are tridiagonal n-by-n matrices A with constant main diagonal and such that ai,i+1ai+1,i= 1 for i = 1, . . ., n − 1.
Jiang Muyan, Spitkovsky Ilya M.
doaj +1 more source
Linear Algebra and its Applications, 1994 Let \(A\) be an \(n \times n\) symmetric matrix with elements in a principal ideal domain \(R\). The author proves that if \(\text{det} A = d \neq 0\) then \(A\) is congruent to a tridiagonal matrix \[ \left[ \begin{matrix} c_ 1 & d_ 1 & & & \;\\ d_ 1 & c_ 2 & d_ 2 & & \;\\ & \ddots & \ddots & \ddots & \;\\ & & d_{n-2} & c_{n-1} & d_{n-1} \\ & & & d_{n-
openaire +2 more sources
Mathematical Methods in the Applied Sciences, EarlyView.ABSTRACT We develop and analyze a fully discrete finite difference approximation for a damped shear beam model with mixed boundary conditions and no rotational inertia. The absence of a second‐order time derivative in the rotational equation gives rise to an asymmetric temporal structure.
Anderson de Jesus Araújo Ramos +3 more
wiley +1 more source
Politopo de Birkhoff acíclico [PDF]
, 2011 Doutoramento em MatemáticaNeste trabalho estabelece-se uma interpreta c~ao geom etrica, em termos da teoria dos grafos, para v ertices, arestas e faces de uma qualquer dimens~ao do politopo de Birkho ac clico, Tn = n(T), onde T e uma arvore com ...
Costa, Liliana Manuela Gaspar Cerveira da
core
Non-Hermitian β-ensemble with real eigenvalues
AIP Advances, 2013 By removing the Hermitian condition of the so-called β-ensemble of tridiagonal matrices, an ensemble of non-Hermitian random matrices is constructed whose eigenvalues are all real.
O. Bohigas, M. P. Pato
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Graph‐Laplacian modeling of spatiotemporal effects for house price estimation
Real Estate Economics, EarlyView.Abstract Many variables involve the modeling of spatial effects, and their dynamics over time. This article presents a linear model in which spatiotemporal random effects are modeled by graph‐Laplacians. A graph‐Laplacian flexibly encodes adjacency in both space and time, in our case not depending on unknown parameters. The graph‐Laplacian can be input
Willem P Sijp, Marc K. Francke
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Computer Graphics Forum, EarlyView.Abstract We introduce mixed super‐circles, a position‐curvature formulation of the original dynamic 2D super‐helix model. Compared to the latter, purely curvature‐based model – the so‐called chained formulation –, the mixed formulation that we propose here drastically reduces the algorithmic complexity of the solving scheme – from quadratic to quasi ...
Emile Hohnadel +2 more
wiley +1 more source
On an infinite family of unipotent Sylvester–Kac-like matrices [PDF]
Notes on Number Theory and Discrete MathematicsClassical Sylvester-Kac matrices are tridiagonal integral matrices with positive off-diagonal entries and fully integral spectra. Here, by relaxing the positivity requirement and using a lower Pascal triangle framework, we define, for each positive ...
Zhibin Du, Carlos M. da Fonseca
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Exit dynamics from organic certification in Quebec
Canadian Journal of Agricultural Economics/Revue canadienne d'agroeconomie, EarlyView.Abstract In Quebec, organic‐certification exits remained persistently high at 5% –7% annually over 2021–2025, while entries fell sharply from 10.8% to 3.4%. By 2025, exits exceeded entries for the first time, contracting the certified stock and reversing a decade of expansion.
Komla Avoumatsodo, Moustapha Thiam
wiley +1 more source
Autoregressive error-processes, cubic splines and tridiagonal matrices [PDF]
, 2003 In the paper formulate for the inversion of some tridiagonal matrices are given.
Drygas, Hilmar
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