Some characterizations of totally nonpositive (totally negative) matrices.
Some comparison theorems for nonnegative splittings of matrices.
Some comparisons of difference schemes on meshes of Shishkin and Bakhvalov type.
Some Computational Aspects of the Consistent Mass Finite Element Method for a (semi-)periodic Eigenvalue Problem
We consider a model eigenvalue problem (EVP) in 1D, with periodic or semi–periodic boundary conditions (BCs). The discretization of this type of EVP by consistent mass finite element methods (FEMs) leads to the generalized matrix EVP Kc = λ M c, where K and M are real, symmetric matrices, with a certain (skew–)circulant structure. In this paper we fix our attention to the use of a quadratic FE–mesh. Explicit expressions for the eigenvalues of the resulting algebraic EVP are established. This leads...
Some Convergent Jacobi-like Procedures for Diagonalising J-Symmetric Matrices.
Some Generalisations of the Theory of Successive Over-Relaxation.
Some inequalities for commutators and an application to spectral variation.
Some iterative Poisson solvers applied to numerical solution of the model fourth-order elliptic problem
The numerical solution of the model fourth-order elliptic boundary value problem in two dimensions is presented. The iterative procedure in which the biharmonic operator is splitted into two Laplace operators is used. After formulating the finite-difference approximation of the procedure, a formula for the evaluation of the transformed iteration vectors is developed. The Jacobi semi-iterative, Richardson and A.D.I. iterative Poisson solvers are applied to compute one transformed iteration vector....
Some New Results on Unsymmetric Successive Overrelaxation Method.
Some -norm convergence results for Jacobi and Gauss-Seidel iterations.
Some parallel procedures for computing the eigenvalues of a real symmetric matrix.
Some remarks on iterative methods for systems of linear equations
Some remarks on the restarted and augmented GMRES method.
Some results on eigenvalues of nonnegative matrices
Some results on matrices of class and their application to the convergence rate of iteration procedures
Some theoretical results derived from polynomial numerical hulls of Jordan blocks.
Sparse finite element methods for operator equations with stochastic data
Let be a strongly elliptic operator on a -dimensional manifold (polyhedra or boundaries of polyhedra are also allowed). An operator equation with stochastic data is considered. The goal of the computation is the mean field and higher moments , , , of the solution. We discretize the mean field problem using a FEM with hierarchical basis and degrees of freedom. We present a Monte-Carlo algorithm and a deterministic algorithm for the approximation of the moment for . The key tool...
Sparse Null Basis Computations in Structural Optimization.
Special Similarity Transformations in Connection with the Quadrant Interlocking Factorisation Techniques
Spectral analysis in connection with iterative solution of convection-diffusion equation.