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two-level algorithm; overcorrection; multigrid algorithm; convergence; efficiency

References:

[1] R. Blaheta: **A multilevel method with correction by aggregation for solving discrete elliptic problems**. Apl. Mat. 31 (1986), 365-378. MR 0863032

[2] R. Blaheta: **Iterative methods for numerical solving of the boundary value problems of elasticity**. Thesis, Ostrava, 1987.

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