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math.DS2026
Characteristic Operators and Spectral Properties of Periodic Evolutionary Systems
Bram Lentjes, Babette A. J. de Wolff
In this paper, we introduce the notion of a characteristic operator for closable linear operators and explore their connected spectral properties via equivalence. Additionally, we…
math.DS2026
Center Manifolds and Normal Forms for Nonlinearly Periodically Forced DDEs
Bram Lentjes, Seppe Daniëls, Meinder Follon +1
The aim of this paper is to provide an effective framework for analysing bifurcations of equilibria in nonlinearly periodically forced delay differential equations. First, we estab…