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arXiv · 2609.27812

Norm of the Hilbert Matrix Operator on Bloch-Type Spaces

Puyu Cui·Zhaopeng Lin·Yufeng Lu
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Abstract

We determine the exact norm of the Hilbert matrix operator $\mathcal H$ on the $α$-Bloch space $\mathcal B^α$ for $1<α<2$, together with all norm-attaining functions of norm one. For $1<α\leq3/2$, we obtain an explicit formula for the exact norm in terms of the Gamma function. For $3/2<α<2$, we obtain an exact one-dimensional maximization formula and show that the corresponding maximum is attained at an interior point of $(0,1)$. We also determine the exact norm of $\mathcal H:\mathcal B^α\to\mathcal B^α_{\log}$. The norm formula changes at the critical parameter $α=4/3$, and the exact norm is obtained for the full range $1<α<2$. The norm-attaining functions are completely characterized for both operators.

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Puyu Cui, Zhaopeng Lin, Yufeng Lu. 2026-08-20. Norm of the Hilbert Matrix Operator on Bloch-Type Spaces. https://arxiv.org/abs/2609.27812

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