Composition Operators on the Dirichlet Space and Related Problems

Chacon, Gerardo A.; Chacon, Gerardo R.; Gimenez, Jose

Composition Operators on the Dirichlet Space and Related Problems

Authors

Chacon, Gerardo A.

Chacon, Gerardo R.

Gimenez, Jose

Description

In this paper we investigate the following problem: when a bounded analytic function $ϕ$ on the unit disk $\mathbb{D}$, fixing 0, is such that $\{ϕ^n : n = 0, 1, 2, . . . \}$ is orthogonal in $\mathbb{D}$?, and consider the problem of characterizing the univalent, full self-maps of $\mathbb{D}$ in terms of the norm of the composition operator induced. The first problem is analogous to a celebrated question asked by W. Rudin on the Hardy space setting that was answered recently ([3] and [15]). The second problem is analogous to a problem investigated by J. Shapiro in [14] about characterization of inner functions in the setting of $H^2$.
8 pages, 1 figure. See also http://webdelprofesor.ula.ve/nucleotachira/gchacon or http://webdelprofesor.ula.ve/humanidades/grchacon