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Spectral symmetry of solutions of boundary value problems in Banach algebras

Volume 128 / 2022

Gerd Herzog, Peer Ch. Kunstmann Annales Polonici Mathematici 128 (2022), 39-48 MSC: Primary 34B15; Secondary 34C14, 46H99. DOI: 10.4064/ap210520-4-10 Published online: 20 January 2022

Abstract

For Banach algebras ${\cal A}$ and solutions $u:[0,1] \to {\cal A}$ of $u”(t)+f(u(t))+ \lambda u’(t)^2=0$, $u(0)=0$, $u(1)=0$, we prove symmetry of the spectrum $\sigma (u(t))$, that is, $\sigma (u(t)) = \sigma (u(1-t))$ for all $t \in [0,1]$, whenever $\sigma (u([0,1]))$ lies in a cone of the complex plane.

Authors

  • Gerd HerzogInstitute for Analysis
    Karlsruhe Institute of Technology (KIT)
    D-76128 Karlsruhe, Germany
    e-mail
  • Peer Ch. KunstmannInstitute for Analysis
    Karlsruhe Institute of Technology (KIT)
    D-76128 Karlsruhe, Germany
    e-mail

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