Algebraic multigrid and algebraic multilevel methods: a theoretical comparison

SUMMARY We consider algebraic methods of the two-level type for the iterative solution of large sparse linear systems. We assume that ane/coarse partitioning and an algebraic interpolation have been dened in one way or another, and review dierent schemes that may be built with these ingredients. This includes algebraic multigrid (AMG) schemes, two-level approximate block factorizations, and several methods that exploit generalized hierarchical bases. We develop their theoretical analysis in a unied way, gathering some known results, rewriting some other and stating some new. This includes lower bounds, that is, we do not only investigate sucient conditions of convergence, but also look at necessary conditions. Copyright ? 2005 John Wiley & Sons, Ltd.

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