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The mortar finite element method with Lagrange multipliers. (English) Zbl 0944.65114
Error estimates of the mortar finite element method under a hybrid formulation for two-dimensional second-order elliptic equations are proved.

MSC:
65N15 Error bounds for boundary value problems involving PDEs
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
35J05 Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation
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