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For the planar Navier–Lamé equation in mixed form with symmetric stress tensors, we prove the uniform quasi-optimal convergence of an adaptive method based on the hybridized mixed finite element proposed in Gong  et al.  [ Numer. Math.   141  (2019) 569–604]. The main ingredients in the analysis consist of a discrete  a posteriori  upper bound and a quasi-orthogonality result for the stress field under the mixed boundary condition. Compared with existing adaptive methods, the proposed adaptive algorithm could be directly applied to the traction boundary condition and be easily implemented.

Quasi-optimal adaptive hybridized mixed finite element methods for linear elasticity