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## 2012.78: Finite and Infinite Elementary Divisors of Matrix Polynomials: A Global Approach

2012.78: Ion Zaballa and Francoise Tisseur (2012) Finite and Infinite Elementary Divisors of Matrix Polynomials: A Global Approach.

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## Abstract

There is general agreement on the definition of the finite elementary divisors of a matrix polynomial $Q(\l)\in\F[\l]^{m\times n}$, where $\F$ an arbitrary field. Regarding the elementary divisors at infinity, or infinite elementary divisors, such an agreement has not been so unanimous. We define the infinite elementary divisors of $Q(\l)$ to be the elementary divisors of $\l^\ell Q(\l^{-1})$ at 0, where $\ell$ is the degree of $Q(\l)$. We show that this is the most natural definition if one applies the usual geometric technique of using homogeneous coordinates to deal with the point at infinity. We call our approach global because the homogeneous invariant factors of $Q(\l)$ are defined for all points of the projective line and to distinguish it from another possible approach that, using local rings, leads to the same conclusions.

Item Type: MIMS Preprint MSC 2000 > 15 Linear and multilinear algebra; matrix theoryMSC 2000 > 65 Numerical analysis 2012.78 Dr Françoise Tisseur 05 September 2012

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• Finite and Infinite Elementary Divisors of Matrix Polynomials: A Global Approach (deposited 05 September 2012) [Currently Displayed]