Extreme points of unit balls of quotients of $L^{\infty}$ by Douglas algebras
Extreme points of unit balls of quotients of $L^{\infty}$ by Douglas algebras
KEIJI IZUCHI I. IntroductionLet H be the space of bounded analytic functions in the unit disk D. Identifying with boundary functions, we consider H as an (essentially) uniformly closed subalgebra of L , the space of bounded measurable func- tions on the unit circle OD with respect to the normalized …