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An analog of H\'older's inequality for the spectral radius of Hadamard products
- Publication Year :
- 2017
-
Abstract
- We prove new inequalities related to the spectral radius $\rho$ of Hadamard products (denoted by $\circ$) of complex matrices. Let $p,q\in [1,\infty]$ satisfy $\frac{1}{p}+\frac{1}{q}=1$, we show an analog of H\"older's inequality on the space of $n\times n$ complex matrices $$\rho(A\circ B) \le \rho(|A|^{\circ p})^{\frac{1}{p}} \rho(|B|^{\circ q})^{\frac{1}{q}} \quad \text{for all $A,B\in \mathbb{C}^{n\times n}$,} $$ where $|\cdot|$ denotes entry-wise absolute values, and $(\cdot)^{\circ p}$ represents the entry-wise Hadamard power. We derive a sharper inequality for the special case $p=q=2$. Given $A,B\in \mathbb{C}^{n\times n}$, for some $\beta \in (0,1]$ depending on $A$ and $B$, $$\rho(A\circ B) \le \beta \rho(|A\circ A|)^{\frac{1}{2}} \rho(|B\circ B|)^{\frac{1}{2}} .$$ Analysis for another special case $p=1$ and $q=\infty$ is also included.<br />Comment: withdraw due to repetition of a main result with existing papers
- Subjects :
- Mathematics - Spectral Theory
15A45, 15A60
Subjects
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1712.00700
- Document Type :
- Working Paper