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For a nonconforming nite element approximation of an elliptic model problem, we propose an a posteriori error estimate in the energy norm which uses as an additive term the "post-processing error" between the original nonconforming finite element solution and an easy computable conforming approximation of that solution. Thus, for the error analysis, the existing theory for the conforming case can be used together with some simple additional arguments. As an essential point, the property is...

A posterioriError Estimates with Post-Processing for Nonconforming Finite Elements