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math.AP2016
Coupling of symmetric operators and the third Green identity
Jussi Behrndt, Vladimir Derkach, Fritz Gesztesy +1
The principal aim of this paper is to derive an abstract form of the third Green identity associated with a proper extension of a symmetric operator in a Hilbert space $\ma…
math.AP2016
Dirichlet-to-Neumann Maps, Abstract Weyl-Titchmarsh -Functions, and a Generalized Index of Unbounded Meromorphic Operator-Valued Functions
Jussi Behrndt, Fritz Gesztesy, Helge Holden +1
We introduce a generalized index for certain meromorphic, unbounded, operator-valued functions. The class of functions is chosen such that energy parameter dependent Dirichlet-to-N…