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math.SP2012
Spectral multiplicity of selfadjoint Schroedinger operators on star-graphs with standard interface conditions
Sergey Simonov, Harald Woracek
We analyze the singular spectrum of selfadjoint operators which arise from pasting a finite number of boundary relations with a standard interface condition. A model example for th…
math.CV2012
De Branges' theorem on approximation problems of Bernstein type
Anton Baranov, Harald Woracek
The Bernstein approximation problem is to determine whether or not the space of all polynomials is dense in a given weighted -space on the real line. A theorem of L. de Brange…