Geometry of Matrix Polynomial Spaces
2020 (English) In: Foundations of Computational Mathematics, ISSN 1615-3375, E-ISSN 1615-3383, Vol. 20, no 3, p. 423-450Article in journal (Refereed) Published
Abstract [en]
We study how small perturbations of general matrix polynomials may change their elementary divisors and minimal indices by constructing the closure hierarchy (stratification) graphs of matrix polynomials' orbits and bundles. To solve this problem, we construct the stratification graphs for the first companion Fiedler linearization of matrix polynomials. Recall that the first companion Fiedler linearization as well as all the Fiedler linearizations is matrix pencils with particular block structures. Moreover, we show that the stratification graphs do not depend on the choice of Fiedler linearization which means that all the spaces of the matrix polynomial Fiedler linearizations have the same geometry (topology). This geometry coincides with the geometry of the space of matrix polynomials. The novel results are illustrated by examples using the software tool StratiGraph extended with associated new functionality.
Place, publisher, year, edition, pages Springer, 2020. Vol. 20, no 3, p. 423-450
Keywords [en]
Matrix polynomials, Stratifications, Matrix pencils, Fiedler linearization, Canonical structure information, Orbit, Bundle
National Category
Computational Mathematics Computer and Information Sciences
Identifiers URN: urn:nbn:se:umu:diva-163512 DOI: 10.1007/s10208-019-09423-1 ISI: 000531825900002 Scopus ID: 2-s2.0-85068193369 OAI: oai:DiVA.org:umu-163512 DiVA, id: diva2:1353896
Funder eSSENCE - An eScience Collaboration Swedish Research Council, E0485301 2019-09-242019-09-242020-10-15 Bibliographically approved