Remarks on a posteriori error estimation for inaccurate finite element solutions

@article{Hackbusch1998RemarksOA,
  title={Remarks on a posteriori error estimation for inaccurate finite element solutions},
  author={Wolfgang Hackbusch and J. U. Wappler},
  journal={Computing},
  year={1998},
  volume={60},
  pages={175-191}
}
Usually, error estimators for adaptive refinement require exact discrete solutions. In this paper, we show how inaccurate solutions (e.g., iterative approximations) can be used, too. As a side remark we characterise iterative solution schemes that are particularly suited to producing good approximations for error estimators. 
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