A two-level additive Schwarz method computes interior multiple and clustered eigenvalues of symmetric elliptic operators with a mesh-independent convergence factor.
Ovtchinnikov , Cluster robustness of preconditioned gradient subspace it eration eigen- solvers, Linear Algebra and its Applications, 415 (2006), pp
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A Two-Level Additive Schwarz Method for Computing Interior Multiple and Clustered Eigenvalues of Symmetric Elliptic Operators
A two-level additive Schwarz method computes interior multiple and clustered eigenvalues of symmetric elliptic operators with a mesh-independent convergence factor.