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acceleration of convergence; two-level algorithm; smoothing transfer operators; algebraic multigrid method; Jacobi iteration

References:

[1] R. Blaheta: **Iterative methods for numerical solving of the boundary value problems of elasticity**. Thesis, Ostrava, 1989. (In Czech.)

[2] S. Míka P. Vaněk: **A modification of the two-level algorithm with overcorrection**. Apl. Math., to appear. MR 1152154

[3] S. Míka P. Vaněk: **The acceleration of a two-level algebraic algorithm by aggregation in smoothing process**.