Abstract
This article is devoted to the construction of a Hermite-type regularization operator transforming functions that are not necessarily C 1 into globally C 1 finite-element functions that are piecewise polynomials. This regularization operator is a projection, it preserves appropriate first and second order polynomial traces, and it has approximation properties of optimal order. As an illustration, it is used to discretize a nonhomogeneous Navier-Stokes problem, with tangential boundary condition.
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