Improved convergence estimate for a multiply polynomially smoothed two-level method with an aggressive coarsening

[摘要] A variational two-level method in the class of methods with an aggressive coarsening and a massive polynomial smoothing is proposed. The method is a modification of the method of Section 5 of Tezaur, Vaněk (2018). Compared to that method, a significantly sharper estimate is proved while requiring only slightly more computational work.

[学科分类] 应用数学

[关键词] two-level method;aggressive coarsening;smoothed aggregation;polynomial smoother;convergence analysis