2 citations · 2 across the 4 of their papers we have counts for
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math.FA2016
On Equivalence and Linearization of Operator Matrix Functions with Unbounded Entries
Christian Engström, Axel Torshage
In this paper we present equivalence results for several types of unbounded operator functions. A generalization of the concept equivalence after extension is introduced and used t…
math.FA2016
Enclosure of the Numerical Range of a Class of Non-Selfadjoint Rational Operator Functions
Christian Engström, Axel Torshage
In this paper we introduce an enclosure of the numerical range of a class of rational operator functions. In contrast to the numerical range the presented enclosure can be computed…