José Manuel Enríquez de Salamanca García

On $H^\infty$ on the complement of C^{1+α} curves

Let $ρ$ be a quasiconformal mapping on the plane with complex dilatation $μ$. We show that if $μ$ satisfies a certain Carleson measure condition, then one can transfer $H^{\infty}$ on the upper half plane onto the corresponding space in the complement of the quasicircle $Γ=ρ(\mathbb{R})$, and that this condition on $μ$ characterizes $C^{1+α}$ curves.