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An application of the abstract multilevel theory to nonconforming finite element methods. (English) Zbl 0828.65125
The authors carefully propose a multilevel product algorithm and its additive version for the Crouzeix-Raviart nonconforming finite element methods for second-order elliptic equations.

MSC:
65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs
65N55 Multigrid methods; domain decomposition for boundary value problems involving PDEs
65F10 Iterative numerical methods for linear systems
35J25 Boundary value problems for second-order elliptic equations
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