Finite codimensional invariant subspaces in Hilbert spaces of analytic functions
Hilbert spaces of analytic functions where multiplication by \(z\) is a subnormal operator with a rich commutant are considered. Invariant subspaces with finite codimension and the Fredholm operators in the commutant are determined.
subnormal operator with a rich commutant
scientific article; zbMATH DE number 599822