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Linear Algebra and its Applications
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Linear Algebra and its Applications
Article . 2007
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Linear Algebra and its Applications
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On the span of Hadamard products of vectors

Authors: Qiu, Li; Zhan, Xingzhi;

On the span of Hadamard products of vectors

Abstract

The Hadamard product \([a_{ij}]\circ\) \([b_{ij}]\)of two \(m\times n\) matrices is the entrywise product \([a_{ij}b_{ij}].\) Let \(A_{1},\dots,A_{k}\) be positive semidefinite \(n\times n\) matrices and let \(R\) be the range of \(A_{1} \circ\dots\circ A_{k}\). The authors prove that \(R\) is spanned by the set \(\{A_{1}x_{1}\circ\dots\circ A_{k}x_{k}~| ~x_{1},\dots,x_{k}\in\mathbb{C}^{n} \}\), and even by the smaller set \(\{A_{1}x\circ\dots\circ A_{k} x~| ~x\in\mathbb{C}^{n}\}\). As a corollary, for any complex \(n\times n\) matrices \(B_{1},\dots,B_{k}\), the range of \(B_{1}B_{1}^{\ast}\circ\dots\circ B_{k}B_{k}^{\ast}\) is spanned by \(\{B_{1}x_{1}\circ\dots\circ B_{k}x_{k}~| ~x_{1},\dots,x_{k}\in\mathbb{C}^{n}\}\) (but not by the smaller set with the \(x_{i}\) all equal). This generalizes a result of \textit{X. Sun, X. Du} and \textit{D. Liu} [Linear Algebra Appl. 416, No. 2--3, 868--871 (2006; Zbl 1106.15020)].

Country
China (People's Republic of)
Related Organizations
Keywords

Numerical Analysis, Vector spaces, linear dependence, rank, lineability, Eigenvalues, singular values, and eigenvectors, Hadamard product, Algebra and Number Theory, range, Discrete Mathematics and Combinatorics, Hermitian, skew-Hermitian, and related matrices, Span, Geometry and Topology, Range

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
8
Average
Top 10%
Top 10%
hybrid