30 citations · 91 across the 25 of their papers we have counts for
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math.SP2015
On the index of meromorphic operator-valued functions and some applications
Jussi Behrndt, Fritz Gesztesy, Helge Holden +1
We revisit and connect several notions of algebraic multiplicities of zeros of analytic operator-valued functions and discuss the concept of the index of meromorphic operator-value…
math.SP2015
Double operator integral methods applied to continuity of spectral shift functions
Alan Carey, Fritz Gesztesy, Galina Levitina +3
We derive two main results: First, assume that , , , are self-adjoint operators in the Hilbert space , and suppose that converges to and $B_…