Wavelet Stabilization of the Lagrange Multiplier Method
S. Bertoluzza
We propose here a stabilization strategy for the Lagrange multiplier
formulation of Dirichlet problems. The stabilization is based on the use of
equivalent scalar products for Sobolev spaces of fractional index, which are realized by means of wavelet
functions. The resulting stabilized bilinear form is
coercive with respect to the natural norm associated to the problem.
A uniformly coercive
approximation of the stabilized bilinear form is constructed for a wide class
of approximation spaces, for which an
optimal error estimate is provided. Finally, a formulation is presented which
is obtained by eliminating the multiplier by static condensation. This
formulation is closely related to the Nitsche's method for solving
Dirichlet boundary value problems.
Numer. Math. 86 (2000), 1--28
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