文摘
The purpose of the paper is to prove a sharp form of Hardy-type inequality, conjectured by Kanjin, for Hermite expansions of functions in the Hardy space \(H^1({\mathbb {R}})\) , that is, \(\sum _{n=1}^{\infty }n^{-\frac{3}{4}}|a_n(f)|\le A\Vert f\Vert _{H^1({\mathbb {R}})}\) for all \(f\in H^1({\mathbb {R}})\) , where \(A\) is a constant independent of \(f\) .