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aggregation class; two-level algorithm; convergence factor; smoothing operator; linear algebraic system

References:

[1] Blaheta R.: **Iteration methods for numerical solution of boundary elasticity problems**. VÚB, Ostrava, 1987, Dissertation. (In Czech.)

[2] Blaheta R.: **A multi-level method with correction by aggregation for solving discrete elliptic problems**. Aplikace matematiky 5 no. 31 (1986), 365-378. MR 0863032 | Zbl 0615.65103

[3] Brandt A.: **Algebraic Multigrid Theory: The Symmetric Case**. Preliminary Proceedings of the International Multigrid Conference, Copper Mountain, Colorado, April 6-8 1983.

[4] Ruge J. W., Stüben K.: **Algebraic Multigrid**. in [5].

[5] **Multigrid Methods. Frontiers in Applied Mathematics**. (Mc Cormick, S. F., ed.), Society for industrial and applied mathematics, Philadelphia, Pennsylvania, 1987. MR 0972752

[6] Míka S., Vaněk P.: **On the convergence of a two-level algebraic algorithm**. Sborník referátů VIII. letní školy Software a algoritmy numerické matematiky (Sušice 1989), JČMF, 1990.