BMO and Lipschitz approximation by solutions of elliptic equations
Joan Mateu, Yuri Netrusov, Joan Orobitg, Joan Carles Rincón I Verdera · Annales de l’institut Fourier · 1996
We consider the problem of qualitative approximation by solutions of a constant coefficients homogeneous elliptic equation in the Lipschitz and BMO norms. Our method of proof is well-known: we find a sufficient condition for the approximation reducing matters to a weak * spectral synthesis problem in an appropriate Lizorkin-Triebel space. A couple of examples, evolving from one due to Hedberg, show that our conditions are sharp.