Some observations on Babu\vs}ka and Brezzi theories
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Summary. Some observations are made on abstract error estimates for Galerkin approximations based on Babuška-Brezzi conditions. A basic error estimate due to Babuška is sharpened by means of an identity that $\| P\|=\|I-P \|$ for any nontrivial idempotent operator P. Some remarks are also made on the Brezzi's theory for mixed variational problems and their Galerkin approximations.
- Some observations on Babu\vs}ka and Brezzi theories
Volume 94, Issue 1 , pp 195-202
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- Mathematics Subject Classification (1991): 65N30
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