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vection using an appropriate numbering of the unknowns
Convergence analysis of an aggregationdisaggregation
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algebraic multigrid method algebraic multilevel iteration Algebraic multilevel preconditioning anisotropy antieigenvalue applications approximation Axelsson basis function boundary value problem coarse grid coefficients composite grid condition number conjugate gradient method consider construction convergence rate corresponding coupling system CRAY J90 defined denotes Dirichlet discretization domain decomposition method efficient eigenvalues elliptic problems factorization finite element method finite element space Gauss-Seidel given GMG method grid points hierarchical basis implementation iterations 2nd grid iterations 5th grid iterative methods Lemma linear systems M-matrix Math Mathematics matrix mesh scale method for solving MRICCG multigrid method multilevel iteration methods multilevel method multilevel preconditioning methods nested Newton iterations nodes nonlinear nonnegative obtain operator parallel computer parameter partition PCG method performance Poisson equation polynomial preconditioned conjugate gradient preconditioner processors projector scalar Schur complement selfadjoint sequence SIAM smoother solver sparse spectrally equivalent subdomains subspace correction symmetric positive definite Theorem Toeplitz matrices two-level unknowns unstructured Vassilevski vector zero