Interpolating functions of minimal norm, star-invariant subspaces and kernels of Toeplitz operators

Author:

Dyakonov Konstantin M.

Abstract

It is proved that for each inner function θ \theta there exists an interpolating sequence { z n } \left \{ {{z_n}} \right \} in the disk such that sup n | θ ( z n ) | > 1 {\sup _n}|\theta ({z_n})| > 1 , but every function g g in H {H^\infty } with g ( z n ) = θ ( z n ) ( n = 1 , 2 , ) g({z_n}) = \theta ({z_n})(n = 1,2, \ldots ) satisfies | | g | | 1 ||g|{|_\infty } \geq 1 . Some results are obtained concerning interpolation in the star-invariant subspace H 2 θ H 2 {H^2} \ominus \theta {H^2} . This paper also contains a "geometric" result connected with kernels of Toeplitz operators.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference11 articles.

1. Pure and Applied Mathematics, Vol. 49;Douglas, Ronald G.,1972

2. The geometry of the unit ball in the space 𝐾¹_{𝜃};D′yakonov, K. M.,1987

3. Moduli and arguments of analytic functions from subspaces in 𝐻^{𝑝} that are invariant under the backward shift operator;D′yakonov, K. M.;Sibirsk. Mat. Zh.,1990

4. Pure and Applied Mathematics;Garnett, John B.,1981

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