Istituto di Matematica Applicata e Tecnologie Informatiche     
Brezzi F. Subgrid scales, augmented problems, and stabilizations. Preprint ercim.cnr.ian//2001-1238, 2001.
We present an overview of some recent approaches to deal with instabilities of numerical schemes and/or subgrid phenomena. The basic idea is that of {it enlarging} (as much as one can) the finite element space, then to do an element-by element preprocessing, and finally solve a problem with the same number of unknowns as the one we started with, but having better numerical properties.
Subject Residual free bubbles, stabilisations

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