A two-level additive Schwarz method computes interior multiple and clustered eigenvalues of symmetric elliptic operators with a mesh-independent convergence factor.
Gallistl , An optimal adaptive FEM for eigenvalue clusters , Numerische Mathematik, 130 (2015), 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.