Generalize Hilbert operator acting on Dirichlet spaces

preprint2022arXivOpen access

Abstract

Let μμ be a positive Borel measure on the interval [0,1)[0,1). For γ>0γ>0, the Hankel matrix Hμ,γ=(μn,k)n,k≥0\mathcal{H}_{μ,γ}=(μ_{n,k})_{n,k\geq0} with entries μn,k=μn+kμ_{n,k}=μ_{n+k}, where μn+k=∫0∞tn+kdμ(t)μ_{n+k}=\int_{0}^{\infty}t^{n+k}dμ(t). formally induces the operator Hμ,γ=∑n=0∞(∑k=0∞μn,kak)Γ(n+γ)n!Γ(γ)zn,\mathcal{H}_{μ,γ}=\sum_{n=0}^{\infty}\left(\sum_{k=0}^{\infty}μ_{n,k}a_k\right)\frac{Γ(n+γ)}{n!Γ(γ)}z^n, on the space of all analytic functions f(z)=∑k=0∞akzkf(z)=\sum_{k=0}^{\infty}{a_k}{z^k} in the unit disc D\mathbb{D}. Following ideas from \cite{author3} and \cite{author4}, in this paper, for 0≤α<20\leqα<2, 2≤β<42\leqβ<4, γ≥1γ\geq1. we characterize the measure μμ for which Hμ,γ\mathcal{H}_{μ,γ} is bounded(resp.,compact)from Dα\mathcal{D}_α into Dβ\mathcal{D}_β.

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