Summary.
We present two a-posteriori error estimators for elliptic partial differential equations, when we use a mixed method. One is based on a adequate evaluation of the residual of the finite element solution and the other on the solution of a local problem. We prove their equivalence with the norm of the error, when the data is locally smooth.
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Received January 3, 1994 / Revised version received November 18, 1994
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Alonso, A. Error estimators for a mixed method . Numer. Math. 74, 385–395 (1996). https://doi.org/10.1007/s002110050222
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DOI: https://doi.org/10.1007/s002110050222