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math.FA2026
On non-negative operators in Krein spaces and their perturbations
Jussi Behrndt, Friedrich M. Philipp, Carsten Trunk
One of the most important contributions of Heinz Langer in the area of operator theory in Krein spaces is the introduction of the notion of definitizable operators and the construc…
math.FA2025
On Differential-Algebraic Equations with Bounded Spectrum in Banach Spaces
Friedrich M. Philipp
The Weierstraà form for regular DAEs in finite dimensions decouples a linear DAE into an ODE and the nilpotent part of the underlying pencil. Here, we provide necessary and suffic…