English

The range of Hilbert operator and Derivative-Hilbert operator acting on $H^1$

Complex Variables 2022-05-26 v1

Abstract

Let μ\mu be a positive Borel measure on the interval [0,1)[0,1). The Hankel matrix Hμ=(μn,k)n,k0\mathcal{H}_{\mu}=(\mu_{n,k})_{n,k\geq0} with entries μn,k=μn+k\mu_{n,k}=\mu_{n+k}, where μn=[0,1)tndμ(t)\mu_n=\int_{[0,1)}t^{n}d\mu(t). For f(z)=n=0anznf(z)=\sum_{n=0}^{\infty}a_nz^n is an analytic function in D\mathbb{D}, the Hilbert operator is defined by Hμ(f)(z)=n=0(k=0μn,kak)zn,zD.\mathcal{H}_{\mu}(f)(z)=\sum_{n=0}^{\infty}\Bigg(\sum_{k=0}^{\infty}\mu_{n,k}a_k\Bigg)z^n, \quad z\in \mathbb{D}. The Derivative-Hilbert operator is defined as DHμ(f)(z)=n=0(k=0μn,kak)(n+1)zn,zD.\mathcal{DH}_{\mu}(f)(z)=\sum_{n=0}^{\infty}\Bigg(\sum_{k=0}^{\infty}\mu_{n,k}a_k\Bigg)(n+1)z^n, \quad z\in \mathbb{D}. In this paper, we determine the range of the Hilbert operator and Derivative-Hilbert operator acting on HH^{\infty}.

Keywords

Cite

@article{arxiv.2205.12622,
  title  = {The range of Hilbert operator and Derivative-Hilbert operator acting on $H^1$},
  author = {Liyun Zhao and Zhenyou Wang and Zhirong Su},
  journal= {arXiv preprint arXiv:2205.12622},
  year   = {2022}
}

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10pages