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Linear Algebra and its Applications
Article
License: Elsevier Non-Commercial
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Linear Algebra and its Applications
Article . 2013 . Peer-reviewed
License: Elsevier Non-Commercial
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Article . 2013
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Completion up to a matrix pencil with column minimal indices as the only nontrivial Kronecker invariants

Authors: Dodig, Marija;

Completion up to a matrix pencil with column minimal indices as the only nontrivial Kronecker invariants

Abstract

This paper deals with a matrix pencil completion problem. Specifically, the author gives explicit, necessary and sufficient conditions for a completion of an arbitrary matrix pencil up to a pencil with a prescribed set of Kronecker invariants, in the case when the only nontrivial invariants of the resulting pencil are its column (or equivalently row) minimal indices. In a previous paper, the author described the possible Kronecker invariants of a matrix pencil with a prescribed subpencil which has only column (row) minimal indices as nontrivial Kronecker invariants. In this paper, she solves the dual problem over an arbitrary field \(\mathbb{F}\), giving complete and explicit solution of the following problem: Let \(A(\lambda) \in \mathbb{F}[\lambda]^{(n+p) \times (n+m)}\) and \(M(\lambda) \in \mathbb{F}[\lambda]^{(n+p+l) \times (n+m+k)}\) be matrix pencils, such that the set of nontrivial Kronecker invariants of \(M(\lambda)\) consists only of its column (row) minimal indices. Find necessary and sufficient conditions for the existence of pencils \(X(\lambda) \in \mathbb{F}[\lambda]^{(n+p) \times k}\), \(Y(\lambda) \in \mathbb{F}[\lambda]^{l \times (n+m)}\) and \(Z(\lambda) \in \mathbb{F}[\lambda]^{l \times k}\) such that the pencil \[ \left[ \begin{matrix} A(\lambda) & X(\lambda) \\ Y(\lambda) & Z(\lambda) \end{matrix} \right], \] is strictly equivalent to \(M(\lambda)\).

Related Organizations
Keywords

completion problem, Kronecker invariants, partitions, matrix pencil, Matrix completion problems, Matrix pencils

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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!
17
Top 10%
Top 10%
Average
hybrid