Results 31 to 40 of about 14,368 (309)
Factorizations of nonnegative matrices [PDF]
Proceedings of the American Mathematical Society, 1972 Suppose A is an n-square matrix over the real numbers such that all principal minors are nonzero. If A is nonnegative, then necessary and sufficient conditions are determined for A to be factored into a product L-U, where L is a lower triangular nonnegative matrix and U is an upper triangular nonnegative matrix with ui, = 1.
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Preconditioning of wavelet BEM by the incomplete Cholesky factorization [PDF]
, 2012 The present paper is dedicated to the preconditioning of boundary element matrices which are given in wavelet coordinates. We investigate the incomplete Cholesky factorization for a pattern which includes also the coefficients of all off-diagonal bands ...
Harbrecht, Helmut
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On Factorizations of Upper Triangular Nonnegative Matrices of Order Three
Discrete Dynamics in Nature and Society, 2015 Let T3(N0) denote the semigroup of 3×3 upper triangular matrices with nonnegative integral-valued entries. In this paper, we investigate factorizations of upper triangular nonnegative matrices of order three.
Yi-Zhi Chen
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Green Matrices, Minors and Hadamard Products
Axioms, 2023 Green matrices are interpreted as discrete version of Green functions and are used when working with inhomogeneous linear system of differential equations.
Jorge Delgado +2 more
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On the Total Positivity and Accurate Computations of r-Bell Polynomial Bases
Axioms, 2023 A new class of matrices defined in terms of r-Stirling numbers is introduced. These r-Stirling matrices are totally positive and determine the linear transformation between monomial and r-Bell polynomial bases.
Esmeralda Mainar +2 more
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Transfer matrices and temporal factorization of the Wilson fermion determinant
, 2022 When lattice QCD is formulated in sectors of fixed quark numbers, the canonical fermion determinants can be expressed explicitly in terms of transfer matrices.
Wenger, Urs
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BMC Bioinformatics, 2023 Background Identifying drug–target interactions (DTIs) plays a key role in drug development. Traditional wet experiments to identify DTIs are costly and time consuming. Effective computational methods to predict DTIs are useful to speed up the process of
Junjun Zhang, Minzhu Xie
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Factorization of matrices into partial isometries [PDF]
Proceedings of the American Mathematical Society, 1989 In this paper, we characterize complex square matrices which are expressible as products of partial isometries and orthogonal projections. More precisely, we show that a matrix T T
Kuo, Kunghwang, Wu, Peiyuan
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On the Efficient Reconstruction of Displacements in FETI Methods for Contact Problems
Advances in Electrical and Electronic Engineering, 2017 The final step in the solution of contact problems of elasticity by FETI-based domain decomposition methods is the reconstruction of displacements corresponding to the Lagrange multipliers for ''gluing'' of subdomains and non-penetration conditions.
David Horak, Zdenek Dostal, Radim Sojka
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Exact Determinants of Some Special Circulant Matrices Involving Four Kinds of Famous Numbers
Abstract and Applied Analysis, 2014 Circulant matrix family is used for modeling many problems arising in solving various differential equations. The RSFPLR circulant matrices and RSLPFL circulant matrices are two special circulant matrices.
Xiaoyu Jiang, Kicheon Hong
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