Istituto di Matematica Applicata e Tecnologie Informatiche     
Bertoluzza S. A relevant property of approximation spaces. Preprint ercim.cnr.ian//1997-1039a, 1997.
We prove a super approximation result for a wide class of approximations spaces (including finite elements and wavelet type spaces). In particular such property, also referred at as the discrete commutator property holds, provided that a projector operator exists, who acts "locally". Such property is used in getting estimates through localization techniques.
Subject 65-XX

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