Error estimators for a mixed method
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- Alonso, A. Numer. Math. (1996) 74: 385. doi:10.1007/s002110050222
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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.