[NotiAMCA] anuncio de conferencia

[pmorin@math.unl.edu.ar]

Dia: viernes 13/2, 15 hs.
Lugar: IMAL-CERIDE, Güemes 3450, Santa Fe

Título, Autor y Abstract:

      Error estimators by gradient smoothing: reliability,
        (local) efficency, and asymptotic exactness

                         Andreas Veeser
               (Universita` degli Studi di Milano)


Many finite element packages incorporate a post-processing procedure
for smoothing the discontinuous discrete gradient. For this reason, an
algorithmically convenient approach to a posteriori error estimation
is based on measuring the difference between the original and
post-processed (typically averaged) gradient.

For a simple model problem, we will discuss such an approach and present
error estimators that are

  * reliabile and (locally) efficient on any mesh,
  * asymptotically exact whenever the post-processed gradient is
    superconvergent,
  * provide information whether or not superconvergence is taking
    place.

This is a joint work in progress with Francesca Fierro (Universita`
degli Studi di Milano).