Journal of Spectral Theory
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Courant’s nodal domain theorem for positivity preserving formsMatthias Keller and Michael Schwarz (1) Universität Potsdam, Germany
(2) Universität Potsdam, Germany
We introduce a notion of nodal domains for positivity preserving forms. This notion generalizes the classical ones for Laplacians on domains and on graphs. We prove the Courant nodal domain theorem in this generalized setting using purely analytical methods.
Keywords: Nodal domain, eigenfunction, Dirichlet form, compact resolvent
Keller Matthias, Schwarz Michael: Courant’s nodal domain theorem for positivity preserving forms. J. Spectr. Theory Electronically published on October 18, 2019. doi: 10.4171/JST/292 (to appear in print)