Abstract
In present paper an approach to construct algebraic two-grid preconditioners for symmetric positive definite matrices which arise in finite element approximation of elliptic equations. As a model problem, Poisson equation in equilateral unit triangle is considered. Multilevel subdivision of hierarchical triangular grids into substructures form the basis of multigrid technique. On each refinement level, the condition number of preconditioned stiffness matrix is evaluated.
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