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## 2012.77: Triangularizing matrix polynomials

2012.77: Leo Taslaman, Francoise Tisseur and Ion Zaballa (2012) Triangularizing matrix polynomials.

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## Abstract

For an algebraically closed field $\F$, we show that any matrix polynomial $P(\lambda)\in \F[\lambda]^{\nbym}$, $n\le m$, can be reduced to triangular form, preserving the degree and the finite and infinite elementary divisors. We also characterize the real matrix polynomials that are triangularizable over the real numbers and show that those that are not triangularizable are quasi-triangularizable with diagonal blocks of sizes $1\times 1$ and $2 \times 2$. The proofs we present solve the structured inverse problem of building up triangular matrix polynomials starting from lists of elementary divisors.

Item Type: MIMS Preprint MSC 2000 > 15 Linear and multilinear algebra; matrix theoryMSC 2000 > 65 Numerical analysis 2012.77 Dr Françoise Tisseur 02 November 2012