Artículo
Finite rank perturbations of linear relations and matrix pencils
Leben, Leslie; Martinez Peria, Francisco Dardo
; Philipp, Friedrich; Trunk, Carsten; Winkler, Henrik
Fecha de publicación:
02/2021
Editorial:
Birkhauser Verlag Ag
Revista:
Complex Analysis and Operator Theory
ISSN:
1661-8254
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We elaborate on the deviation of the Jordan structures of two linear relations that are finite-dimensional perturbations of each other. We compare their number of Jordan chains of length at least n. In the operator case, it was recently proved that the difference of these numbers is independent of n and is at most the defect between the operators. One of the main results of this paper shows that in the case of linear relations this number has to be multiplied by n+ 1 and that this bound is sharp. The reason for this behavior is the existence of singular chains. We apply our results to one-dimensional perturbations of singular and regular matrix pencils. This is done by representing matrix pencils via linear relations. This technique allows for both proving known results for regular pencils as well as new results for singular ones.
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Articulos(IAM)
Articulos de INST.ARG.DE MATEMATICAS "ALBERTO CALDERON"
Articulos de INST.ARG.DE MATEMATICAS "ALBERTO CALDERON"
Citación
Leben, Leslie; Martinez Peria, Francisco Dardo; Philipp, Friedrich; Trunk, Carsten; Winkler, Henrik; Finite rank perturbations of linear relations and matrix pencils; Birkhauser Verlag Ag; Complex Analysis and Operator Theory; 15; 2; 2-2021; 1-37
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