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In this paper, we derive computable  a posteriori  error bounds for approximations computed by the Uzawa algorithm for the generalized Stokes problem. We show that for each Uzawa iteration both the velocity error and the pressure error are bounded from above by a constant multiplied by the  L 2-norm of the divergence of the velocity. The derivation of the estimates essentially uses  a posteriori  estimates of the functional type for the Stokes problem.

On a posteriori error bounds for approximations of the generalized Stokes problem generated by the Uzawa algorithm