Upper bounds for Z$_1$-eigenvalues of generalized Hilbert tensors

TL;DR

This paper establishes upper bounds for the Z$_1$-spectral radius of infinite-dimensional and finite-dimensional generalized Hilbert tensors, revealing how these bounds depend on the parameter bb and the tensor dimensions.

Contribution

It introduces the concept of Z$_1$-eigenvalues for generalized Hilbert tensors and derives explicit upper bounds for their spectral radii in both infinite and finite dimensions.

Findings

Spectral radius not larger than c0 for bb > 1/2

Spectral radius at most c0/sin(bbc0) for 0 < bb c2 1/2

Upper bounds depend only on tensor dimension and bb

Abstract

In this paper, we introduce the concept of Z$_1$-eigenvalue to infinite dimensional generalized Hilbert tensors (hypermatrix) $\mathcal{H}_\lambda^{\infty}=(\mathcal{H}_{i_{1}i_{2}\cdots i_{m}})$, $$ \mathcal{H}_{i_{1}i_{2}\cdots i_{m}}=\frac{1}{i_{1}+i_{2}+\cdots i_{m}+\lambda},\ \lambda\in \mathbb{R}\setminus\mathbb{Z}^-;\ i_{1},i_{2},\cdots,i_{m}=0,1,2,\cdots,n,\cdots, $$ and proved that its $Z_1$-spectral radius is not larger than $\pi$ for $\lambda>\frac{1}{2}$, and is at most $\frac{\pi}{\sin{\lambda\pi}}$ for $\frac{1}{2}\geq \lambda>0$. Besides, the upper bound of $Z_1$-spectral radius of an $m$th-order $n$-dimensional generalized Hilbert tensor $\mathcal{H}_\lambda^n$ is obtained also, and such a bound only depends on $n$ and $\lambda$.