Abstract
Let B φ be a bounded linear functional on the Hardy space H 1 on the bidisc, defined by an essentially bounded function φ. When φ is a continuous function, we study the solution set S φ of an extremal problem, that is, S φ = { f ∈ H 1: B φ(f) = ‖B φ‖ and ‖ f ‖1 = 1}.
Acknowledgements
This research is partially supported by Grant-in-Aid Research No.20540148.