27 citations · 113 across the 31 of their papers we have counts for
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Note on spectra of non-selfadjoint operators over dynamical systems
Siegfried Beckus, Daniel Lenz, Marko Lindner +1
We consider equivariant continuous families of discrete one-dimensional operators over arbitrary dynamical systems. We introduce the concept of a pseudo-ergodic element of a dynami…
Perturbations of positive semigroups on -spaces
Christian Seifert, Marcus Waurick
We give a characterization of a variation of constants type estimate relating two positive semigroups on (possibly different) -spaces to one another in terms of corresponding…
A quantitative version of Gordon's Theorem for Jacobi and Sturm-Liouville operators
Christian Seifert
We prove a quantitative version of Gordon's Theorem concerning absence of eigenvalues for Jacobi matrices and Sturm-Liouville operators with complex coefficients.
Dirichlet forms for singular diffusion in higher dimensions
Uta Freiberg, Christian Seifert
We describe singular diffusion in bounded subsets of by form methods and characterize the associated operator. We also prove positivity and contractivity of the…