22 citations · 36 across the 26 of their papers we have counts for
4 papers · 1 filter
Block numerical ranges for linear relations
Rabeb Aydi, Hannes Gernandt, Omaima Kchaou +2
Linear relations are multivalued generalizations of linear operators whose spectral properties are closely linked to the stability of differential-algebraic equations. Consequently…
On characteristic invariants of matrix pencils and linear relations
Hannes Gernandt, Francisco Martínez Pería, Friedrich Philipp +1
The relationship between linear relations and matrix pencils is investigated. Given a linear relation, we introduce its Weyr characteristic. If the linear relation is the range (or…
The spectrum and the Weyr characteristics of operator pencils and linear relations
Hannes Gernandt, Carsten Trunk
The relation between the spectra of operator pencils with unbounded coefficients and of associated linear relations is investigated. It turns out that various types of spectrum coi…
Locally finite extensions and Gesztesy-Šeba realizations for the Dirac operator on a metric graph
Hannes Gernandt, Carsten Trunk
We study extensions of direct sums of symmetric operators . In general there is no natural boundary triplet for even if there is one for every…