On Bloch approximation and the boundedness of integration operator on $H^\infty$
Wayne Stewart Smith, Dmitriy Mikhailovich Stolyarov, Alexander L'vovich Vol'berg · arXiv (Cornell University) · 2016
We obtain a necessary and sufficient condition for the operator of integration to be bounded on $H^\infty$ in a simply connected domain. The main ingredient of the proof is a new result on approximation of Bloch functions.