, Volume 74, Issue 4, pp 385-395

Error estimators for a mixed method

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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.

Received January 3, 1994 / Revised version received November 18, 1994