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20162026
most citedOn applications of Herglotz-Nevanlinna functions in material sciences, I: classical theory and applications of sum rules

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math.SP2026

On eigenvalues of self-adjoint extensions for defect larger than one

Annemarie Luger, Jakob Reiffenstein

Self-adjoint extensions of a symmetric operator are parametrised by Krein's formula, in which the -function interacts with another analytic function (the parameter). We obtain a…